UNIX for Dummies Questions & Answers

find $download_dir -iname "$filename" | perl -lne '($f = $_) =~ s/\/(\w|\.)+$/\L$&/ and print "$_ $f"'

find $download_dir -iname "$filename"| perl -lne '($f = $_) =~ s/\/(\w|\.)+$/\L$&/ and rename $_, $f'

find $download_dir -iname "$filename" | while read f; do   
    dir_path=${f%/*}
    filenode=${f##*/}
    lower=$(echo "$filenode" | tr '[[:upper:]]' '[[:lower:]]')

    if [[ $lower != $filenode ]]; then
       #remove the echo and surrounding "" if you see what you want
        echo "mv -v $f ${dir_path}/${lower}"
    fi
done

mv -v path path

find $download_dir -iname "$filename" | awk '
BEGIN {	FS = OFS = "/" }
{	l = tolower($NF)
	if(l != $NF) {
		orig = $0
		$NF = l
		printf("mv -v \"%s\" \"%s\"\n", orig, $0)
	}
}' | sh

mv /a/B/C/Exam.f95 /a/b/c/exam.f95

mv /a/B/C/Exam.f95 /a/B/C/exam.f95

find . -type f -name '*.[Ff]95' -name '*[A-Z]*' |
while read f
do
 (
  cd `dirname "$f"` &&
  mv `basename "$f"` `basename "$f" | tr '[A-Z]' '[a-z]'`
 )
done