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#!/bin/sh
# can use ls pipe to sed pipe to bash, similar to eval? see comment at link:
# link also show perl-rename approach
# https://linuxconfig.org/rename-all-files-from-uppercase-to-lowercase-characters
# if only change ' ' to '_' `rename` might be sufficient, for upper to lower case might need perl-rename if want concise
find "$@" -depth -exec sh -c 'mv -nvT -- "$1" "$(echo "$1" | tr "[:upper:] " "[:lower:]_")"' shell '{}' \;
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