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content/blog/bashvalidateip.md

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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
+```
+