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#!/bin/sh
# references:
# https://stackoverflow.com/questions/1842254/how-can-i-find-all-of-the-distinct-file-extensions-in-a-folder-hierarchy
# not sure if find here need -depth, not sure if mv here need -n and -T
outdir ()
{
find . -type f -execdir mv -nt "$PWD" -- '{}' \+
find . -mindepth 1 -maxdepth 1 -type d -delete
}
indir ()
{
find . -maxdepth 1 -type f | awk -F. '!a[$NF]++{print $NF}' | xargs mkdir --
find . -mindepth 1 -maxdepth 1 -type d -execdir basename -az -- '{}' \+ | xargs -0 -I _ find . -maxdepth 1 -type f -name '*._' -execdir mv -t '_' -- '{}' \+
}
case "$1" in
'-o') outdir;;
'-i') indir;;
*) outdir; indir;;
esac
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