IntroToLinux

1. Understanding Filters

What Are Filters?

Filters are commands that:

• Read input from stdin or files
• Process or transform the data
• Write output to stdout
• Can be chained together with pipes
• Follow Unix philosophy: “Do one thing well”

Common Filter Categories:

• Content filters: grep, sed, awk
• Field processors: cut, awk
• Sorting: sort, uniq
• Counting: wc, uniq -c

• Transformation: tr, sed

Navigation

Next: → The Cat Command And Tee Utility
Previous: ← Learning Objectives
Lesson Home: ↑ Lesson 7: Filters & Pipelines Course Home: ⌂ Introduction to Linux