Hi
http://tldp.org/LDP/abs/html/parameter-substitution.html
В Пн, 12/09/2016 в 12:22 -0700, Mike Wright пишет:
> Hi all,
>
> This one's not in my unix nutshell book :/
>
> Extracting the sound from some music videos (mp4's) into mp3's:
>
> for f in "$(ls *.mp4)"; do
> ffmpeg -i "$f" -c:a libmp3lame "${f%.mp4}.mp3";
> done
>
> I'm not familiar with this notation: ${f%.mp4}, where $f is the name
> of
> an mp4, e.g. "my favorite video.mp4". Can somebody explain this to
> me?
>
> TIA,
> Mike Wright
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