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Using grep: 5 game-changing command examples

The Linux grep command is a powerful search tool. From my experience, I’ve realized that most of the power I get from it comes from just a handful of options. These are the ones I reach for constantly ...
Ars Technica

Linux/BSD Command Line 101: Using awk, sed, and grep in the Terminal

A key point to these tools (from a practical point ) is that they are very memory efficient and allow work on just a "line".