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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
+
+# ./_filename will be renamed ./filename, not what I want, need improve
+# -exec can't replace -execdir here, can write a -exec version
+
+find "$@" -depth -execdir sh -c 'dest="$(echo "$1" | tr -d "\047" | sed -E -e "s/([[:lower:]])([[:upper:]])/\1_\2/g" | tr "[:upper:] " "[:lower:]_" | tr -s "[:punct:]" | sed -E -e "s#/-#/#g" -e "s/_([[:punct:]])/\1/g" -e "s/([[:punct:]])_/\1/g" | tr -s "[:punct:]")"; [ -e "$dest" ] || mv -v -- "$1" "$dest"' shell '{}' \;