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28 lines
723 B
Markdown
28 lines
723 B
Markdown
---
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title: "Quick Bash: Validate IP Address"
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date: 2020-12-19T20:15:24-05:00
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draft: false
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tags: ["Bash", "Networking"]
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medium_enabled: true
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---
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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?
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First the script would need to check if `ipcalc` exists.
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```bash
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if ! command -v ipcalc > /dev/null ; then
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echo "ipcalc not found. Exiting..."
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exit 1
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fi
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```
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Now for this example, we'll validate an IP address stored in the variable `$IP`.
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```bash
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if ! ipcalc -cs "$IP" ; then
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echo "Invalid IP Address"
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exit 1
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fi
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```
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