website/content/blog/bashvalidateip.md

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---
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date: 2020-12-20 01:15:24
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draft: false
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medium_enabled: true
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medium_post_id: c7a65890d9d9
tags:
- Bash
- Networking
title: 'Quick Bash: Validate IP Address'
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---
`ipcalc` is a terminal tool that lets you validate an IP address. This proves useful to me as I have scripts that automate certain remote tasks given an IP address. Instead of trusting that an argument passed is a valid IP, why not check it?
First the script would need to check if `ipcalc` exists.
```bash
if ! command -v ipcalc > /dev/null ; then
echo "ipcalc not found. Exiting..."
exit 1
fi
```
Now for this example, we'll validate an IP address stored in the variable `$IP`.
```bash
if ! ipcalc -cs "$IP" ; then
echo "Invalid IP Address"
exit 1
fi
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```