Rename all items in a directory to lowercase names 

for name in *; do mv "$name" "${name,,}"; done

April 20, 2013 — EvaggelosBalaskas

Explanation

Loop over the items in the current directory, and use Bash built-in case modification expansion to convert to lower case.

Limitations

The case modification extension ${name,,} requires Bash 4.

file-management string-manipulation
for mv

Related one-liners

Rename all files in a directory to lowercase names 

paste <(ls) <(ls | tr A-Z a-z) | while read OLD NEW; do echo mv -v $OLD $NEW; done

August 5, 2011 — bashoneliners