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59 lines
1.1 KiB
Markdown
59 lines
1.1 KiB
Markdown
---
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title: "Partial Argument Parse and Passing in Bash"
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date: 2020-09-07T21:33:26-04:00
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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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Let's say we want to augment an existing terminal command (like for example `wget`). We then want to be able to add or edit command line options. The rest of this post provides an example that hopefully you can use in your bash script.
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```bash
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#!/bin/bash
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# Custom help function
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show_help() {
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echo "Usage: custom_command [arguments]"
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echo " --name <name>"
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echo " --flag_example"
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echo " <additional arguments to be passed along>"
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exit 0
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}
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# Defaults for our custom flags or parameters.
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name=""
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flag_example=0
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# Loop through and take out our custom parameters
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# from the parameter list.
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i=0
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numargs=$#
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while test $i -lt "$numargs"
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do
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case "$1" in
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"--help")
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show_help
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;;
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"--name")
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shift
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name=$1
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;;
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"--flag_example")
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flag_example=1
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;;
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*)
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set -- "$@" "$1"
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;;
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esac
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shift
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i=$((i+1))
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done
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# Do something here using our custom parameters
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# Pass our non-custom parameters to the application
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wget "$@"
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```
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