Shell commands for various tasks

audio_one_liners.sh

#/bin/bash

# Convert all the files in a directory from M4A (Apple Lossless) to FLAC
find . -name "*.m4a" | sort -n | while read -r filename
do
ffmpeg -i "$filename" -f flac "$filename.flac"
done

# Rename all the files from `.m4a.flac` to `.flac`
# Afterward, clean up with `rm "*.m4a"`
find . -name "*.flac" | sort -n | while read -r filename
do
mv "$filename" "$( echo "$filename" | sed 's/\(.*\)\.m4a\.flac$/\1.flac/' )"
done

pdf_one_liners.sh

#/bin/bash

# Split a PDF of 2-page spreads (left/right) into separate pages.
# Splits the width of the page exactly in 2, so the original PDF
# needs to be cropped correctly before running this.
mutool poster -x 2 -r <input.pdf> <output.pdf>