Quickly Rename Files in Terminal

Every now and then I create a file on the command-line and fat finger it. When I create a readme for a project, I might type README.mdss instead of README.md for example. When it comes time to fix it, I do the following:

mv ~/Repos/felicianotech/my-project/README.mdss ~/Repos/felicianotech/my-project/README.md

It works, and autocompletion helps, but I’m lazy. Here’s a quicker way to rename that same file:

mv ~/Repos/felicianotech/my-project/README.md{ss,}

The curly braces tell your command-line shell Bash (or in my case, Fish), to expand the second command to the first command. Less typing. ;)