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Brandon Rozek 2020-12-19 20:20:31 -05:00
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---
title: "Quick Bash: Validate IP Address"
date: 2020-12-19T20:15:24-05:00
draft: false
tags: ["bash"]
---
`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
```