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34 lines
1.2 KiB
Markdown
34 lines
1.2 KiB
Markdown
---
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title: "Parsing CLI Flags in Bash"
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date: 2019-08-06T16:55:47-04:00
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draft: false
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tags: [ "Bash" ]
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medium_enabled: true
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---
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I was creating a bash script and was looking around for a solution for parsing command line arguments. [This StackOverflow post](https://stackoverflow.com/questions/192249/how-do-i-parse-command-line-arguments-in-bash) has a variety of different solutions available. I want to describe my favorite of these posts.
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[Inanc Gumus](https://stackoverflow.com/users/115363/inanc-gumus) proposed the following:
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```bash
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#!/bin/bash
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while [[ "$#" -gt 0 ]]; do case $1 in
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-d|--deploy) deploy="$2"; shift;;
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-u|--uglify) uglify=1;;
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*) echo "Unknown parameter passed: $1"; exit 1;;
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esac; shift; done
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echo "Should deploy? $deploy"
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echo "Should uglify? $uglify"
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```
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Let me quickly describe what it does. While the number of arguments left to process is greater than zero....
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- Check to see if the argument matches any of the flags
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- If it does...
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- If the flag requires an additional argument grab it. Then discard an argument.
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- If it doesn't. Error out.
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- Then get rid of an argument.
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At the end of the while loop, you would've evaluated all the arguments!
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