Most Linux distros come with a command line utility called rename pre-installed, which, as the name implies, can rename multiple files at once. This tool is actually a Perl script, and takes as an argument a regular-expression based renaming rule, which changes all file names that are matched with the rule. The usage of rename is as follows.
rename [-vnf] <regular_expression> <files>
With "-n" option, rename will show what files would be renamed, without actually changing file names. This option is useful when you want to test a renaming rule beforehand.
To change the extension of all files from .JPEG to .jpg:
To convert all uppercase letters to lowercase counterparts:
To strip the extension of all files matching "*.bak":
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