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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
# pass awk script as argument trick from url:
# https://unix.stackexchange.com/questions/282503/right-syntax-for-awk-usage-in-combination-with-other-command-inside-xargs-sh-c
# -exec can't replace -execdir here, see cli notes for the -exec way
find "$@" -depth -execdir sh -c 'mv -nvT -- "$2" "$(echo "$2" | awk "$1" )"' shell '{sub(/\/-+/,"/");gsub(/ +/,"_");gsub(/_*-+_*/,"-");print tolower($0)}' '{}' \;
# for test
#mkdir -p ~/test/TE\ ST/; rm -rf ~/test/TE\ ST/1t/; cp -r ~/test/0t/ ~/test/TE\ ST/1t/; mvtr ~/test/TE\ ST/1t/; tree ~/test/TE\ ST/1t/
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