Text Processing (Grep/Sed/Awk)

Extracting CSV Columns Without External Parsers

🧩 The Challenge

Dealing with CSV files that contain thousands of rows and multiple columns makes manual filtering or standard shell tools difficult to manage. Standard column extractors often break when fields contain quoted commas or varying delimiters.

💡 The Fix

Use awk with a field separator configuration that defines the delimiter and allows you to print specific indexed columns from the stream.

awk -F',' '{print $1, $3}' input.csv

⚙️ Why It Works

The -F flag tells awk to use a comma as the input field separator, and the print instruction outputs only the first and third columns for every line processed.

🚀 Pro-Tip: Use the OFS variable inside a BEGIN block to define a different character for the output separator, such as a tab or pipe.

Linux Tips & Tricks | © ngelinux.com | 7/8/2026