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run s/run/the-correct-program/ $@ run dispatches command line arguments to a program, based on the files #!, then based your configuration in your .runrc file(s). I find this useful for running a number of different types of scripts with the same command in my IDE/Text editor. For example, I program in Ruby and Node.js. I want to use the same command to run my scripts, despite having to switch between two languages. All I need to do now is run: run my_spec.rb In my .runrc file, I have a mapping between files with the extension .rb and ruby. Here is my ~/.runrc file. #!/bin/bash file=$1 if [[ $file =~ .rb$ ]]; then exec ruby $@; fi if [[ $file =~ .js$ ]]; then exec node $@; fi run also allows you to configure a separate .runrc file in a directory-specific basis. For example, I'm working on my fork (http://github.com/btakita/jasmine-node) of the jasmine-node project. In order to run specs, I need it to go through the specs.sh script within that project. To accomplish that, I add the following to the top line of each spec: #!/usr/bin/env jasmine-node --forceexit