Bash rename multiple files with one command

Ever had the need to correct multiple filenames?

S0501_SomeName
S0502_SomeName
S0503_SomeName
S0504_SomeName

The following command will allow you to replace the substring and insert another string (or just replace it with an empty string) if needed.

for filename in *.m4v; do newname=`echo $filename | sed 's/S05/S04/g'`; mv $filename $newname; done

Which will transform the sample list to:

S0401_SomeName
S0402_SomeName
S0403_SomeName
S0404_SomeName

HTH