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Substitute spaces in filename with underscore, it work on the first space encountered.
This command converts filenames with embedded spaces in the current directory replacing spaces with the underscore ("_") character.
This will change all files ending in .JPG to .jpg and will work with any file extension
Note the g for global in the perl expression; without it, only the first occurrence in the name would be replaced.
Changing a file extension to a new one for all files in a directory.
Useful when you want to quickly rename a bunch of files.