Shell Scripting / Bash Tricks

Stop the madness of parsing shell command output by hand

🧩 The Challenge

You know that feeling when you’re writing a script, you run a command like ip addr or ps, and suddenly you’re spending two hours fighting with cut and awk just to pull out one piece of data? It’s a total headache when the output format shifts slightly or you’re stuck dealing with erratic whitespace.

💡 The Fix

Start using read or mapfile with custom delimiters to chop up output strings directly into shell variables. It’s way cleaner and less likely to break when your environment changes.

read -r _ ip _ <<< $(ip route get 8.8.8.8 | grep src)
echo "My exit IP is: $ip"

⚙️ Why It Works

By defining the IFS or just using shell variable assignment, you skip the need for external pipes entirely. Bash does the heavy lifting of splitting the string into array-like elements based on the spaces it finds.

🚀 Pro-Tip: Use read -r to prevent backslashes from being treated as escape characters—always use it.

Linux Tips & Tricks | © ngelinux.com | 9/19/2026