I was creating a bash script and was looking around for a solution for parsing command line arguments. This StackOverflow post has a variety of different solutions available. I want to describe my favorite of these posts.
Inanc Gumus proposed the following:
#!/bin/bash while [[ "$#" -gt 0 ]]; do case $1 in -d|--deploy) deploy="$2"; shift;; -u|--uglify) uglify=1;; *) echo "Unknown parameter passed: $1"; exit 1;; esac; shift; done echo "Should deploy? $deploy" echo "Should uglify? $uglify"
Let me quickly describe what it does. While the number of arguments left to process is greater than zero….
- Check to see if the argument matches any of the flags
- If it does…
- If the flag requires an additional argument grab it. Then discard an argument.
- If it doesn’t. Error out.
- Then get rid of an argument.
At the end of the while loop, you would’ve evaluated all the arguments!