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Rename 's/\.JPG/\.jpg/' * #rename the first occurrence of.

Note that this will rename the first occurrence of JPG within the filename and not just the extension. It substitutes (s) any occurrences of JPG and replaces them with jpg. This is much like using a regular expression on a string in perl, but renames the files.įor example to rename files with JPG to jpg (if required due to the case-sensitive filenames in Linux) then the following can be used: The command takes the form of a regular expression followed by the files to apply the changes to.

The rename command allows you to use perl regular expressions to define this files will be renamed and how. On my system the /usr/bin/rename command links to the file /usr/bin/prename. Unlike mv, rename is not built in to the shell, but is commonly installed on most Linux systems. There is however another command called rename. This takes two arguments the first being the current filename and the second being the new filename. The normal command for renaming a file is mv (move). renaming files is one area where it is often quicker and easier to batch rename a number of files using a command line program or short script. Although knowledge of the command line is not required to use Linux sometimes it can come in very helpful.