Is there a way to rename all files in a directory to lowercase|uppercase?
I am looking for a oneliner command.
I loved TotalCommander's Alt + F7, now I need that functionality in the Terminal.
For each file a_file in current directory rename a_file to lower case.
for a_file in *;do mv -v "$a_file" `echo "$a_file" | tr [:upper:] [:lower:]` ;done;
For upper case reverse the arguments to [:lower:] [:upper:]
tr command reference link
Update
For even more control * can be replaced with ls.
For example in a directory containing 1.txt, 2.txt, 3.txt, 1.jpg, 2.jpg and 3.jpg in order to filter only *.jpg files, ls can be used:
for a_file in $(ls *.jpg);do mv -v $a_file `echo $a_file | tr [:upper:] [:lower:]` ;done;
The above code will assign to a_file variable all files with .jpg extension.
Update added -v option to mv command as per sds suggested.
