#! /bin/bash
Usage="Usage: $name file ..."
phelp()
{
echo "$name: change filenames to lower case.
$Usage
Each file is moved to a name with the same directory component, if any,
and with a filename component that is the same as the original but with
any upper case letters changed to lower case."
}
name=${0
while getopts "h" opt; do
case "$opt" in
h) phelp; exit 0;;
*) echo "$Usage" 1>&2; exit 2;;
esac
done
shift $((OPTIND - 1))
for file; do
filename=${file case "$file" in
*/*) dirname=${file%/*} ;;
*) dirname=. ;;
esac
nf=$(echo $filename | tr A-Z a-z)
newname="${dirname}/${nf}"
if [ "$nf" != "$filename" ]; then
mv "$file" "$newname"
echo "$0: $file -> $newname"
else
echo "$0: $file not changed."
fi
done