The command line approach to changing file extensions is quite fast and the file extensions will be changed rapidly, with no warning dialogs or confirmations.Īnd to reiterate once again, this is not to convert any file types or change anything but the file extension name. Assuming you are in the directory where you wish to change all files in the current directory to a new file extension, here is the syntax to use:įor file in *.txt do mv "$file" "$.jpeg" done In the first example, we’re going to change all files in the present working directory with the extension “.txt” and change them to “.py” instead. How to Change All File Extensions in a Directory via the Command Line Failure to do so could result in data loss, the Terminal is unforgiving to typos or mistakes, so don’t skip your backups. OK? Alright on to the command line approach using a simple one line bash script.īy the way you should always make a copy and/or backup of the files you are modifying, particularly if you are new to the command line. Now you need to give the new file name, here you have two options based on where you want your new file to be. However, the Terminal is not the only way to do this, and so if this is too advanced or irrelevant to your user skill set then recall that Mac OS offers simple tools to both batch rename files in Mac OS and batch change file extensions in the Finder as well, neither of which requires the command line at all. Type mv then open Finder and drag the file on terminal (this is to copy the full path of file to the terminal) Note. Additionally, this walkthrough approach is intentionally using the command line and is thus aimed at more advanced users. On macOS you can install it using popular package manager Homebrew as follows: brew install rename Here's the equivalent of the command at the top using rename: rename -n -e 's/.//'. name \*.Before beginning, realize this is not changing a file type, it is only changing the file extension. If you find yourself batch-renaming files frequently, consider installing a specialized tool such as the Perl-based rename utility. Remove the -dry-run to actually execute the command rather than just tell you what it would do.Īlternatively, this should work with GNU Parallel which you can install on macOS with: brew install parallel The command would be: rename -dry-run -N "00001" 's/.jpg$/_$N.jpg/' *jpg This should work with rename which you can install on macOS with: brew install rename These are powerful commands that will make lots of changes very rapidly - please test on a copy of a small subset of your data.
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