Rename all files and images using Mac Terminal

Ever had a folder of images with completely random file names and just wished they were all in a clean numberic order, eg: 1.jpg, 2.jpg etc.

This code byte is a simple way of achieving just that.

Fire up your Mac Terminal and follow the following steps:

Open Applications>Utilities>Terminal.app.

And follow the code byte below, basically you CD (Change directory) so terminal is looking at the folder you want to make changes to and then pretty much copy paste the single line loop. It will rename files into the 00n.fileExtension format. Eg: 001.jpg, 002.jpg, 003.png.

cd ~/yourfolderlocation/path/imagesarehere/
// (Or type <code>cd  and then drag the folder onto terminal

i=1; for f in *; do mv "$f" $(printf %03d $i).${f#*.}; let i++; done

Explanation:
for each file found; do “move” filename variable”; done loops over your files. file is the variable that holds filenames.

n, initially set to 1 and increased by one in every iteration with let n++, is the integer suffix for the renamed files.

If you wish to get fancier and control the naming structure it’s this line that handles the naming:
$(printf %03d $i).${f#*.}
Where %03d $i is 001 and .${f#*.} is the file extension.