Oh-Rename 
If you know JavaScript RegExp, you know orn, a super simple batch renamer.
Usage
Just like String.prototype.replace(<pattern>, <replacement>) in cli,
which <pattern> could be a RegExp or String,
and <replacement> could be a String or Arrow Function:
Usage: orn <pattern> <replacement> [-d]
Arguments:
<pattern> The pattern to be replaced, could be a String or RegExp.
<replacement> The String to be replace with, Arrow Function is supported.
Options:
-h, --help Output usage information
-v, --version Output the version number
-d, --dry-run Show how the files will be renamed, but actually do nothing
Examples:
orn 720p 1080P # Replace "720p" with "1080P".
orn /720p/i 1080P # Replace "720p" or "720P" with "1080P".
orn '/(\.js)$/i' '.min$1' -d # Add ".min" to js files, in dry-run.
orn '/\S+mp3$/' 'x=>x.toLowerCase()' # Change mp3 filename to lowercase.
Switches
-d, --dry-run
Show how the files will be renamed, but actually do nothing.
License
MIT © Amio