A couple more:
afconvert(1) - an audio file format converter, which includes Apple's superior AAC codec from the Core Audio framework
diskutil(8) - tons of tools for fixed and removable storage
afconvert in.wav -o out.m4a -q 127 -s 2 -b 160000 -f m4af -d 'aac '
mb=300; diskutil eraseVolume APFS myramdisk `hdiutil attach -nomount ram://$((mb*2048))`I would like to also recommend the app:
hear (macOS speech recognition and dictation via the command line)
(Uses built-in macOS capabilities for transcription from audio to text.)
Its open source GitHub repo at https://github.com/sveinbjornt/hear
Man page at https://sveinbjorn.org/files/manpages/hear.1.html
> (Uses built-in macOS capabilities for transcription from audio to text.)
Question (to self, currently researching)... Which capabilities? Released when? I ask because Apple Intelligence has expanded the use of audio transcription features.
Answer: `hear` uses SFSpeechRecognizer [1] which has been available since macOS 10.15. I'm not yet sure how it relates to Apple Intelligence transcription services.
Note: "speech recognition is a network-based service" which perhaps suggests Apple Intelligence (the marketing term, not an Apple Developer term, I don't think) uses it as well
[1][ https://developer.apple.com/documentation/speech/sfspeechrec...
I thought I recognized the name of the developer! The person that brought us Platypus! Nice.
I used Platypus to make my simple command line tools accessible to coworkers who considered the command line to be "too much" to learn. I've loved that app for close to two decades.
> which hear
> hear not found
macOS 15.1
Hear itself isn't a built-in utility.
> hear is a command line interface for the built-in speech recognition capabilities in macOS
Have you gone through the installation process? https://github.com/sveinbjornt/hear?tab=readme-ov-file#insta...
Someone needs to create a brew formula for `hear`.
Same, but there is the `say` command which you can cat a text file into and it will say it outloud
Few additions.
open -n file.pdf : opens new instance of Preview application which is useful if you want to open the same file twice (for example to look at different pages at once).
caffeinate -d : prevents display turning off, useful if you want to look at display without moving mouse.
Another useful caffeinate tip is the `-w` option.
You can use it to pass a pid to keep the computer awake until that process completes. I use it for longer-running scripts that I don't want interrupted
I use this all the time:
open -a <GUI Application> <File>
Handy for distinguishing between editing and consuming media.
open -a is nice, i use it with alias, ex:
alias qt='open -a "quicktime player"'
alias vlc='open -a "vlc"'At least for me (I've installed vlc via homebrew), there is a vlc binary in the PATH, and I can just vlc <filename>
The point here is to open a document with an app not assigned as default for the given mime-type by file name extension.
That's one of macOS pitfalls: the inability to open 2 instances of the same app, simply using the default GUI is annoying sometimes.
I think Windows is right in that matter...
open -a "Finder" . - open Finder in the current directory.
Standard apps usually just need the name, like Finder and Safari but you can also specify the path "/Applications/DifferentFinder.app"
`open .` works for me too
Yeah, I scrolled a bit and noticed that. Never thought about using just that.
Finder is pretty good, and it's handy to be able to open it from the terminal. But I find it super annoying it litters everything with .DS_Store files and there is no way to turn that off, except for external and network drives. Aside from, obviously, using a different file manager. Very un-Apple.
Well those files are to keep the view/presentation settings.
I guess you could do that centrally with some sort of database but that would open another can of worms; and most importantly you wouldn't be able to transfer a folder and keep its Finder presentation intact.
Nowadays it's not as useful because of the App Store but when software was only released as .dmg images, it became expected to open a nice layout with graphics presenting the app and a shortcut to the App folder that you would drag'n'drop the app bundle to.
This presentation relies of .DS_Store to work.
There are some other use cases like that, it all comes down to a simple fact: Apple has always cared a lot more about how things look than Microsoft ever did, this is a perfect example.
There are extended attributes which could be used for this task.
The .DS_Store files are not Finder specific; Apple treats everything as a file (including folders), and it exists to supply folders and the files within them with metadata.
It is just the first time the .DS_Store file is needed is often when the folder is touched by Finder.
.DS_Store is also a bug. I’m not sure why it hasn’t been fixed. It’s history is quite interesting but I don’t recall where I read about it.
https://www.arno.org/on-the-origins-of-ds-store linked from original Hacker News thread: https://news.ycombinator.com/item?id=40870357
Actually, .DS_Store is very Apple indeed (not that I care much).
You can also `open -R file` to select that file in Finder.
you can just
open .
Also, `cd .` to open the current directory in a Finder window.
Not mine (found online years ago), but here's the opposite. `cd` into the frontmost Finder window:
cd "$(osascript -e 'tell app "Finder" to POSIX path of (insertion location as alias)')";You mean `open .`
Yeah, I had just woke up. Drat.
You can also just drag the proxy icon onto the terminal window for its path, ie “cd “ <drop>, enter.
I use that all the time. You can also cmd-c copy a file in Finder then paste into the terminal to get its path.
Does `open` give focus? It used to, but since a few releases ago the app opens in the background, which is pretty annoying.
My poor workaround is to use osascript: `tell application "System Events" to set frontmost of process "Finder" to true`
Apparently, it does. There is a -g flag (background) to prevent focus.
Isn’t open opening apps in the background a consequence of having “secure keyboard entry” enabled in Terminal.app?
`caffeinate -disu` is the best combination (that is, enable all options): your laptop won't go to sleep, won't dim the screem etc.
caffeinate -d is incredibly useful for work... uh reasons
Jiggler is better for that at least from a set-it-and-forget-it perspective vs. caffeinate where you have to manually set it.
The terminal version of Disk Utility is actually much better than the GUI (it doesn't hang and the app is glitchy.
Docs are at https://ss64.com/mac/diskutil.html
Disk Utility used to be excellent, a model of how an app should be. But then they rewrote it in Swift and now it's just bad.
Apple promotes Swift heavily but the results are not really encouraging. I don't think the "so-so" results are entirely because of Swift (probably due to newer, less battle tested software and also newer/younger devs) but still the fact is, all the not-so-great new software from Apple came with Swift rewrites, hard to not make a connection...
I have known the UI bring bad in general and I think it has more due to APFS… I used to be able to do backups but APFS is so different to everything else that at this point I wish Apple switched to ZFS but honestly that wasn’t gonna happen after the buyout of Sun to oracle .
https://www.reddit.com/r/mac/comments/18ez5b0/why_disk_utili...
`pdisk` might be more convenient if you've worked with `gdisk` on ArchLinux
If you have a modern Mac you have very little business using `pdisk`. It is only for editing disks mapped with an “Apple Partion Map”. This is obsolete replaced in practice by GPT on modern apple machines.
`gdisk` supports GPT, but to partition system SSD you need to deactivate System Integrity Protection:
gdisk /dev/disk0diskutil does more than edit partitions, though.
Or "man diskutil"
Although not built in, we have a list of easy to install command-line utilities for macOS.
https://terminaltrove.com/categories/macos/
You might find one you've never heard of that is useful! :)
Kinda related: does anyone else regularly finds CLI tools, installs them and never ever even call them once?
Ha, when I search through my history I usually find I ran them exactly once, right after installing, and then forgot all about them. But there are some exceptions, I often use httpie instead of curl, MTR is great, I am liking doggo instead of dig...
That's the difference between recall memory and recognition memory. The GUI took off because we can recognize a menu and easily figure out where we need to go, versus having to memorize obscure and cryptic commands. Honestly having a LLM spit out command line arguments is probably the best way forward if things don't have a GUI.
I found a tool of mine submitted by someone else on the site (pleasant surprise!) and I want to update the description and add a more recent/better image. How would I do that?
Send us a message, we will update it very quickly!
This looks like a list of cross-platform command line tools. What about it is Mac-specific?
There is also 'say' which is great if you need to step away from a long running command, in a similar fashion to ringing the terminal bell but with more context.
That's in there.
This article contains links to https://ss64.com/ , which is an amazing resource that I wish I'd known about sooner!
100% That's why I made it a point to share that page.
I still get a ton of mileage from reading the macOS How-to page https://ss64.com/mac/syntax.html
Thanks for the kind words, I'll be scanning this thread to see if there's anything new that I've missed.
More:
nc(1) - netcat, arbitrary TCP and UDP connections and listens
networkQuality - Speed test + network stress tool.
system_profiler(8) - Useful way to grab extensive system information in shell scripts.
wdutil(8) - wdutil provides functionality of the Wireless Diagnostics application in
command line form.networkQuality is in the article.
If you want the least useful macOS commandline utility, 'pdisk' is:
"...a menu driven program which partitions disks using the standard
Apple disk partitioning scheme described in "Inside Macintosh: Devices".
It does not support the Intel/DOS partitioning scheme[.]"Looks like the site's down.
Thanks for the heads up! It should be back up now
One-liner for previewing a file with Quick Look. I aliased this to `ql` :)
qlmanage -p $argv >/dev/null 2>&1I'm curious if there's a way to do this with standard input instead of having to supply a filename?
I do this with man pages but it opens up in a full Preview window, not QuickLook.
You can use process substitution[0] to have a command output act as a file:
qlmanage -p <(man man) >/dev/null 2>&1
Related - https://news.ycombinator.com/item?id=36491704 "macOS command-line tools you might not know about"
TinkerTool provides a GUI that runs some useful commands under the hood
I actual wrote a similar post a while back: https://www.chriswales.uk/blog/my-favourite-macos-terminal-c...
networksetup was one of my favourites as well as du and caffeinate.
The 'security' command is new to me so thanks!
Not a command, but a little known feature of the Terminal app:
(shift+command+K) or Menu 'Shell' -> 'New Remote Connection...'
opens a SSH, S(FTP), TELNET connection manager window!
And sometimes handy: shift+cmd+. to toggle showing hidden (dot) files in Finder.
Sort of like command+k in the Finder, connects to a server. You can type in vnc://host or vnc://localhost:port... the latter is for VNC to hosts via an SSH tunnel.
It's quite a good VNC client, too.
As they seem to have removed Bluetooth Explorer and all ways to get diagnostic info about the bluetooth system and/or change codecs and settings, does anybody know any good cmdline ways in later mac osxes to do the same?
For example I'm having a problem that comes and goes now and then where Bluetooth audio is 300 ms delayed compared to the video playback everywhere except in Youtube on Safari, very strange. It's good for a few months then suddenly it becomes unusable, then back to zero sync delay after a few months.
I was thinking this might be related to CODEC selections etc or some hidden setting that might get changed which we normally aren't allowed to determine :)
(btw I know there is a difference between latency and synchronization - latency might be unavoidable but video sync should always be able to compensate - I got curious on how exactly that works, where in the app / SDK / OS pipeline does the a/v sync happen on a Mac?)
Thanks.. but that github program only lists the same info you get if you command-click on the BT icon in the menu bar. It basically only shows the device name.
I guess filtering the streaming log entries in the Console app gives some info.
To find what causes your laptop drains its battery, you can use
sudo powermetricsThanks Spotify:
coreaudiod is using very high CPU at 111.90 ms/s
I'm on a 16" M1 Macbook Pro 16 gig.
If spotify use the coreaudio daemon for the decoding it can be spotify's fault for this CPU usage, don't you think ?
Maybe they are using it "wrong" but Apple Music isn't exactly light on ressource either...
$ say Hello
To scare your teammates when you are logged in remotely optionally with
$ osascript -e "set volume output volume 100"
A fun easter egg in the "say" command is that "OS X" is said as "Oh Ess Ten".
You can also change voices with -v. My favorite is "cellos" since it sings to you.
Not sure that's an easter egg? That's been the pronunciation for 25 years.
It's at least manually programmed in. Otherwise it would have said 'Ecks'
It actually understands roman numerals, to a certain extent. E.g. `say LVIII` will say "58". However, `say MCMLXXIX` speaks some gibberish that ends in the word "six", for some reason.
It also knows how to say numbers up into the trillions but not more than that (although I feel like it used to).
Other cute `say` tricks: muck around with OSX Default Speech Voice (to a siri-ish voice) and you can invoke that from the CLI.
I hacked together a little script for demo recording like:
START_FROM="$1"
STARTED=0
function transcript() {
ID="$1"
TO_SAY="$2"
if [[ ...STARTED || START_FROM && ID... ]]; then
STARTED=1
say "$TO_SAY"
fi
}
transcript "STEP001" "This is a test"
transcript "STEP001b" "of the emergency broadcast system"
transcript "STEP002" "This is only a test, if this was ..."
transcript "STEP003" "...etc..."
That way I can iterate on voiceover scripts, eg: `./demo-script "STEP002"` => `./demo-script --output`
It's really helpful for iterating on pronunciations, eg: `transcript "STEP005" "In case of Four Hundred and Four errors..."`, I can just "skip to" and iterate against that line (and subsequent ones), or "skip back" and hear it in more of a flowing context.
...even if I don't end up using the `say`-generated audio, having a transcript (and even pacing) that I can just read through with my own voice is super helpful.
My non-built-in CLI utility recommendations, none of which are macOS specific:
* atuin - TUI for shell history, backed by SQLite - https://github.com/atuinsh/atuin
* LSD (LSDeluxe) - rewrite of `ls` - https://github.com/lsd-rs/lsd
* ripgrep - https://github.com/BurntSushi/ripgrep
* fzf - command-line fuzzy finder that enhances file search, command history search, and more - https://github.com/junegunn/fzf
Notes:
- To get pretty extra file/folder symbols with LSD, you'll probably need to install some special fonts.
- You can use `fzf` and `ripgrep` together.
I can vouch for fzf being a game-changer if you spend a lot of time in the CLI
My problem with fzf is that it's so broadly useful that I forget it exists.
It's probably been written about a lot of places already.
For me, increasing the number of icons in the launcher grid was very useful.
After running these three commands, the size of the Launcher will be set to 13x8 apps:
defaults write com.apple.dock springboard-columns -int 13
defaults write com.apple.dock springboard-rows -int 8
defaults write com.apple.dock ResetLaunchPad -bool TRUE; killall Dock
To get a complete list of parameters, you can execute
defaults readI'll add `plutil` to the list. It's great for reading plist files, but did you know it can parse json too?
/usr/bin/plutil -extract your.key.path raw -o - - <<< "$jsoninput"
(obviously, less useful now that `jq`is built in)
; which jq
/usr/bin/jq
; jq
jq - commandline JSON processor [version 1.6-159-apple-gcff5336-dirty]
Starting in macOS 15, it was quietly included.
Glad to spread the good word ;)
> obviously, less useful now that `jq`is built in
Hold up, what?
I've never heard of networkQuality, that's seems like quite a useful tool.
For reference, it’s been there since macOS 12. You may also like to know that this year (macOS 15) they added jq.
I didn't know that, thanks!
Unfortunately, it's not actually very useful, as whatever server they're using on the other end is severely constrained. networkQuality gives me:
Downlink: 884.856 Mbps, 198 RPM - Uplink: 13.238 Mbps, 198 RPM
whereas speedtest (whether to the official speedtest server OR a friend's home server in their basement!) gives ~700 Mbps uplink.
try
networkQuality -s
Somewhat better, 867/114, but still not the symmetric I get on typical real workloads.
There is also pmset which is very useful (since macOS doesn't give a UI counterpart) https://support.apple.com/en-am/guide/mac-help/mchl40376151/...
Oh this is pretty neat, thanks for sharing!
I have this .zshrc function to track the battery and charging, which uses pmset:
function batt-info() {
echo
system_profiler SPPowerDataType | grep Wattage | cut -c 7-
echo
pmset -g batt
}I've found reliably "turning on" with pmset to be hit or miss. I can't remember the gotcha I ran into if it was that you had to have your laptop lid open or something else...
pbcopy and pbpaste are handy, for a version that works over ssh connections there is osc: https://github.com/theimpostor/osc
since I switch between linux and macos a lot I wrote a dotfile function called "clip" that will work the same on both. nice thing is it will automatically paste if nothing is piped to it to copy so there's no need to use separate commands... although I just realized it might be nice to have a "passthrough" mode that both copies and pastes if you add this to a pipeline in order to capture some intermediate part to the clipboard
if [[ "$(uname)" == "Darwin" ]]; then
clip() {
[ -t 0 ] && pbpaste || pbcopy
}
else # assume linux if not macos
clip() {
[ -t 0 ] && xclip -o -selection clipboard || xclip -selection clipboard
}
fiI went the route of managing a different set of dotfiles for linux and macOS. Same repository, just different branches.
Also, falling back to using oh-my-zsh functionality.
That's handy, thanks! `osc copy` may also take args for files to copy to the clipboard, but in the absence of that and no data on stdin it maybe should switch to paste.
At my job I have to work with a lot of JSON that's usually minimized. This command has single-handedly saved my sanity:
$ pbpaste | jq | pbcopy
Then I can paste it into whatever text editor I want and it's all nice & pretty-printed for me.
Bonus is that I don't have to change the command at all, just copy the minimized JSON to the clipboard (say from DBeaver, for example), then hit the 'up' arrow and enter.
I never knew that jq without any arguments pretty-printed JSON. Very useful, and great tip to combine with pbcopy/pbpaste.
I copied this functionality to linux it's been so useful.
It misses the most important of them all, if you are used to copy content to usb drive for reading on a multimedia player : dot_clean -m
I have thousands of old photos that preview can open, but I can’t upload them into the photo.app because the file format is wrong. I’m going to try and use SIPS to convert them all into png first and then add to photo.app. Thanks for this pointer.
Similarly, I've had trouble getting audio files into a format that the Books app understands (for ebooks), until I found
afconvert -v -s 3 -f m4bf filename.mp3Nice. After reading the man page, I see that it can be used to convert image file formats:
sips -s format png photo.HEIC --out photo.png
sips -z 300 600 original.jpg --out new.jpgsips looks really cool, thanks for pointing this out.
Not gonna lie, I missed this because I thought it was related to macOS SIP, System Integrity Protection. Which is something I am deeply uninterested in.
That's cool. I wish it could convert webp images.
Since Apple spent so much effort in getting certified:
https://www.opengroup.org/openbrand/register/
These are all guaranteed to work:
https://pubs.opengroup.org/onlinepubs/9699919799/utilities/
(I may not have linked to the precisely correct version.)
I got this trick from someone on the Internet:
$> long_running_command && say "Witness me, for I am done"
Yep, I do this in a tmux session. But sometimes I'm on a call and forget and the ROBOT VOICE says "DATABASE DUMP IS COMPLETE" and I jump out of my skin.
I'm sure everyone knows this, but `open` has an equivalent on Linux: `xdg-open`.
Except xdg mime types are easily heist-able by programs and there is no universal truth for it.
Install vscode on Linux and have fun with it hijacking opening directories. Which is easy enough to fix (with a bit of know how) or work around but annoying.
MacOS is far from perfect but open always doing what I expect is a good example of what Apple did well.
What I'm really missing still is a cli to iCloud stored passwords. AFAIK 'security' cli can't access the credentials stored in the cloud. This would be helpful to store secrets outside of git but would still allow scriptable access to them similarly as 1password cli 'op' has.
I maintain a more comprehensive list here: https://notes.billmill.org/computer_usage/mac_os/mac_os_comm...
But I don’t have uuidgen!
I'm fascinated by "sips" which has a full JavaScript interpreter built into it for rendering images using an entirely undocumented (as far as I can tell) Canvas-like API: https://til.simonwillison.net/macos/sips
Does anyone remember the shortcut that brings up a list of currently available keyboard shortcuts for the current app? It may not be built-in, in which case it was a free utility.
Cheatsheet? I've used it for years. Just hold down Command for a few seconds to see a list of all available shortcut keys in the current app.
Great tip about the `security` command, a new one for me.
Here's a handy use I've found for mdfind.
Say you've got a directory that has scripts or data files related to some thing you do. For example I've got several scripts that I use when I scan books with my book scanner. I only need these when doing book scanning stuff so don't want to put them somewhere in $PATH. I want to be able to easily run them from scripts that aren't in that directory, but I don't want to hard code the path to that directory.
Solution: in the directory with the book scanning scripts I make a file named ID that contains a unique string. I currently use 16 byte random hex strings [1].
I have this script, named find-dir-by-ID, somewhere in $PATH:
#!/bin/zsh
ID=${1:?Must specific ID}
IDSHA=`echo $ID | shasum | cut -d ' ' -f 1`
mdfind $ID 2>/dev/null | grep /ID | while read F; do
FSHA=`shasum $F | cut -d ' ' -f 1`
if [ $IDSHA = $FSHA ]; then
dirname $F
exit 0
fi
done
exit 1
SCRIPT_DIR=`find-dir-by-ID 54f757919a5ede5961291bec27b15827`
if [ ! -d $SCRIPT_DIR ]; then
>&2 echo Cannot find book scanning scripts
exit 1
fi
The IDs do not have to be hex strings. If I'd thought about it more I probably would have made IDs look like this "book-scanning:54f757919a5ede59" or "arduino-tools:3b6b4f47bf803663".
[1] here's a script for that:
#!/bin/sh
N=${1:-8} # number of bytes
xxd -g $N -c $N -p -l $N < /dev/urandomWhy not just a directory with subdirectories by ID? No mdfind needed, no problems with just-created directories, no wait, etc
You mean something like having ~/well-known-stuff and under that having a 54f757919a5ede5961291bec27b15827 directory with the book scanning scripts and so on?
That could work fine, but generally the directories I've used this on are directories that I want to have somewhere else, and with a reasonable name. Usually the directories came first and various other things in fixed relative positions were using them, and then later I wanted to use them from elsewhere and added the ID.
I suppose ~/well-known/stuff/54f757919a5ede5961291bec27b15827 could by a symbolic link to the original.
The mdfind approach does have the advantage that if I reorganize things and move the directory it keeps working.
Want to scan the local wifi networks from the command line, and get useful information like signal strength?
/System/Library/PrivateFrameworks/Apple80211.framework/Versions/A/Resources/airport -s
I set a shell alias so I can just do `airport -s`. I've no idea why this is hidden away inside some framework and not in a directory which is in the normal path, but there you go.
FWIW that appears to be soon deprecated according to MacOS 15.2:
WARNING: The airport command line tool is deprecated and will be removed in a future release. For diagnosing Wi-Fi related issues, use the Wireless Diagnostics app or wdutil command line tool.
Oh, that's a pity. I'm pretty bad at keeping up to date on MacOS releases, but I should probably start figuring out `wdutil` so that my muscle memory is adapted before I've got no choice!
is there a way to do monitor mode scanning with wdutil like the `airport -s` command? asking for a friend...
plutil. Maybe not that useful to a lot of people but I have been going through and collecting bookmarks and Safari bookmarks are binary files. plutil is a means of converting the binary property file to a json or xml file.
Looks like a lot of these have linux equivalents that could be aliased. I wonder if anyone's made a set of those for regular macos users who occasionally use something else.
locate
locate searches a database for all pathnames which match the specified pattern. The database is recomputed periodically, (about once a week) and contains the path-names of all files which are publicly accessible.
The database is not set up by default.
Your better bet on MacOS is to use `mdfind -name ....`
I have that aliased to `locate` on mine. It's not exactly the same but it gets me 99% of the way there.
"I like to look at the list of macOS Bash commands."
Sigh. These are shell commands, not "Bash commands".
These are programs, not shell commands.
If you're going to correct someone snarkily, don't make a similar mistake...
Even calling them "zsh commands" would have been more accurate.
shameless plug for my mac lsblk port https://github.com/JakeTrock/gosblk
fs_usage is my favourite - find out what's thrashing the disk. (Usually Spotlight or Spark...)
pbcopy is my favorite. Almost enough to prefer a mac over my usual linux stations, but you can get that on linux easy enough.
cliclick[1] is useful for gap-filling the AppleScript accessibility APIs when automating poorly-behaved applications.
TIL: caffeinate
Very useful.
For a GUI version, Amphetamine is quite nice (and free). https://apps.apple.com/us/app/amphetamine/id937984704?mt=12
yes amphetamine I use regularly when I want to charge my android phone during travel with lid closed.
That's interesting, I have never needed to do that. My Pixels have always just charged even if the lid is closed, on Intel and Apple Silicon machines. I like to travel light so I often use my laptop as a battery bank instead of carrying a seperate one.
Indeed, many applications I would expect to prevent sleeping (some audio playback ones, games, etc.) don't implement this. I assume it's a case of Apple's APIs changing over the years and not everyone catching up/caring. At one point I had downloaded Amphetamine[^1] but it is much nicer to just use the terminal here.
The "newest" and still supported low level API is almost 14 years old: https://developer.apple.com/documentation/iokit/kiopmasserti... https://developer.apple.com/documentation/iokit/kiopmasserti...
While it may avoid sleep, it doesn’t prevent inactivity, in my experience. For instance, my chat app at work will still show me inactive while running caffeinate. I have to do non-interactive training semi-regularly and need to interact to keep from looking like I’m away from my desk.
Have you used the `-u` flag? From the manual:
-u Create an assertion to declare that user is active.Doesn’t work with Slack at least. I’ve had an iTerm window running `caffeinate -disu` for years. I think it used to work and stopped working in the last few months.
I was able to install a `caffeine` package with Apt on Linux. In that one the `caffeinate` command is supposed to be run with another command. While the `caffeine` command does what macOs `caffeinate` does.
It would be cool to have this activate when a Jupyter notebook is currently running a cell, and deactivate automatically when its finished.
This can be done by passing a PID. I believe there are other options, as well. (Not at my computer to look it up right now.) I haven't used those features "manually", but I have in scripts that I expect to generate long-running processes.
afconvert is pretty nifty for audio format conversion.
is it better than ffmpeg in any way?
Apple's AAC encoders are often touted as being the 'best', quality-wise: https://hydrogenaud.io/index.php/topic,119876.0.html
As jammmety said; for AAC encoding yes, but don't worry - you can have ffmpeg use that encoder to get the best of both.
afconvert is the only way I've managed to turn mp3s into something that Books would accept as an audiobook.
afconvert -v -s 3 -f m4bf ....mp3mdls shows a file's metadata.
I use it most often for pulling lat lon data from photos.
> If you store your secrets in the Keychain (and you should!)
As part of the OS, Keychain suffers from the same sorts of sharp edges as using a built-in interpreter. An alternative is to use a password manager. Below is an example of the tools available in one.
https://developer.1password.com/docs/cli/get-started/#step-1...
Would you mind expanding on what these "sharp edges" are that you're warning about? I'm not really sure what you mean by this. Keychain has served me (and I imagine many others) really well for a while.
upgrade_mac.sh: https://github.com/westurner/dotfiles/blob/develop/scripts/u... :
upgrade_macos() {
softwareupdate --list
softwareupdate --download
softwareupdate --install --all --restart
}[dead]
Mostly I use XLD (https://tmkk.undo.jp/xld/index_e.html) for audio conversion (as I'm mostly converting from .BIN + .CUE to "iTunes Plus" AAC for uploading to iTunes Match); but my understanding is that under the covers it's mostly just using afconvert (or whatever the system-framework equivalent of it is.)
So if your needs are just "one audio file in, one audio file out, and let me tell you exactly what it should look like", then afconvert is probably what you want.
XLD is great. The best thing about it is the heavy parallelization if you have many cores to throw at the problem. You can convert mountains of albums very fast.
Love those type of OG Mac indie software.
Yes, iTunes also uses the same Core Audio framework. In fact, even iTunes on Windows uses the same code base through the Quicktime-for-Windows libraries it runs off of.
I prefer to encode with afconvert on the command line because it gives me a few more options for tweaking things, that I don't have access to in iTunes (or "Music" as it's called these days). Additionally, I use a simple shell script that handles all of it when for example ripping a whole CD.
> afconvert
Oh wow! A while back I ripped some concert audio from Youtube, but it was too large for me to sync using my `iTunes Match`. I've been too lazy to figure out how to downsample it juuuuust enough. But it looks like this works right out of the box
"superior" ... It looks silly to include such a judging adjective in the description of a comman line utility. I don't need "subtle" Apple ads on the command line. And aac is about the last format I would choose, encoding my audio in.
To be very clear, the man page is claiming that Apple's implementation of the AAC codec [the encoder specifically] is superior to other implementations of AAC encoding; not that AAC is superior to other audio codecs.
If you're wondering how one implementation of an audio codec could be superior to others — mostly, it's because any lossy audio codec has an encoding phase called "psychoacoustic compression", where each implementation of the codec is free to do whatever it likes to "simplify" the waveform in some way (most easily pictured: by taking a Discrete Cosine Transform of the waveform, and then quantizing / convoluting some parts of the frequency space. Like what JPEG does to discard information from the chroma channels.)
IIRC, rather than blunt-force quantization, Apple's AAC encoding does clever things (akin to the instrument separation done to audio in Melodyne) to split the waveform into "features", and then discards information in such a way that the features' separability is maintained (i.e. it doesn't become harder to "pick out" any given "sound" from the audio.)
Correct. Though AAC (when produced with a proper encoder) surpasses all other lossy formats with the exception of Opus.
I think those are the commenter's descriptions, not Apple's man page synopses. My system has
Its quality is technically superior as evident from the product's PSNR and other factors. There are no "ads" here, I'm not a brand warrior, and nobody cares what formats are the last ones you'd encode your audio in.
How does that compare with ffmpeg? The arguments seem about the same.
afcovert uses the superior inbuilt AAC converter. FFmpeg can do this as well with the right arguments but you have to dig them up and the quality is capped to a lower value than you can get with afconvert.
There's no reason to use AAC when we have both OPUS and FLAC.
I have three reasons: when using a good encoder (Core Audio, FDK or Nero) it's a quality-wise better lossy format than MP3, it's smaller than FLAC which matters for storage footprint, and unlike Opus and FLAC it's supported pretty much everywhere. At some point Opus will reach the same level of adoption and that's the point where I'll make the switch from AAC, because Opus is evidently a better lossy encoder per same bitrate.
ffmpeg offers a few different encoders for many of its supported audio/video formats, and the result depends on what encoder you tell ffmpeg to use. It does not have support for using Core Audio on macOS but it does offer FDK AAC, which is one of the better AAC encoders available today - though not nearly as good as the one available in Core Audio.
It does. -c:a aac_at uses Core Audio (_at means AudioToolbox).
Do you have any sources/informations on an objective comparison of encoders quality ?
Way back then (iPod era), I made an exposé for a science exam (small paper), proving that AAC was indeed better than MP3 both subjectively and objectively at most bitrates. This is how I got introduced to Fourier transforms and the likes; it was very interesting to see that you can literally "see" the difference in quality on the encoded waveform output.
But I just used the default encoders on the Mac and I didn't think about going in deep into encoder comparisons at the time. Does it matter that much? From what I know, it just about properly programming a math spec, with some tricks but I wonder if that makes that much of a difference.
In any case, above 256kbps it takes a very skilled listener to correctly identify encoded music. Apple has some useful tools for that, particularly AU Lab that allows you A/B testing of tracks with on-the-fly encoding. https://www.apple.com/apple-music/apple-digital-masters/
>From what I know, it just about properly programming a math spec
Incorrect. The specification only concerns the bitstream and the decoding. Encoders are free to do whatever they want, as long as they produce a valid bitstream.
One source would be the Hydrogen Audio forums where there are regular scientific comparisons - PSNR etc. instead of blind listening tests - between various encoders and formats. Apple's AAC encoder consistently comes out well above anything MP3, best of all the AAC encoders, and up at the absolute top together with Opus which produces a bit better results per same bitrate.
> Does it matter that much? From what I know, it just about properly programming a math spec, with some tricks but I wonder if that makes that much of a difference.
It does matter a lot and the difference can be staggering. Producing the audio bitstream is a case of both effectively analyzing the original input and programmatically expressing the waveform as correctly and as efficiently possible. Two excellent examples: the old MP3 encoder Xing, which compared to LAME produces very poor material even at higher bitrates, and one of the earliest open-source AAC encoders, FAAC, which also renders a very poor product. A lot of "early adopters" got bitten by FAAC and many of them still stubbornly cling to the misunderstanding that AAC is a worse format than MP3.
Opus is better at same bitrate - not by much, but all the same it has the upper hand.