mp3 - Time length of an audio file from unix command line - Stack Overflow
You could use ffprobe, for example:

ffprobe -v quiet -show_entries format=duration sample.mp3

The output can be also in JSON format:

ffprobe -v quiet -print_format json -show_format sample.mp3

To extract only the duration using jq:

ffprobe -v quiet -print_format json -show_format sample.mp3 | jq '.[].duration'

Another tool is sox:

sox sample.mp3 -n stat

And probably the shortest one:

soxi -D sample.mp3
mp3  unix  linux 
october 2017
Apprenticeship Patterns
When implementing the Breakable Toys pattern, make your systems relevant and useful to your life as an apprentice. For example, build your own wiki, calendar, or address book. Your solutions might be massively overengineered for the problem they’re solving, and probably could easily be replaced by something off the shelf. However, these projects are where you are allowed to fail. They’re the projects where you can try ideas and techniques that might lead to catastrophic failure. But the only one who can be hurt by their failure is you.
october 2017
osx - error in dired sorting on OS X - Stack Overflow
I installed coreutils through Homebrew, and it apparently installs /usr/local/bin/gls. I ln -s'd this to /usr/local/bin/ls and then I didn't get the error in Emacs any more. – duma Feb 19 '13 at 15:19
osx  dired  emacs 
october 2017
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