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Hectal
Phase 2Beginner3 of 9 in Linux

Text Processing & the Unix Philosophy

Small, single-purpose tools, piped together — the idea that makes the command line more powerful than any GUI for real text work.

Almost everything on a Linux server is plain text — config files, logs, command output. This phase is about the small set of tools built specifically to search, transform, and combine text, and the ONE idea (piping tools together) that makes them dramatically more powerful in combination than any of them are alone.

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4 topics ~53 min 5 code blocks & diagrams
Start with the first topic
1
2.1

The Unix Philosophy: Pipes and Redirection

Each Unix tool does ONE thing well, and the pipe (|) is what lets you chain them into a custom pipeline — this single idea is arguably the most powerful concept in this entire course.

13 min 1 diagram 1 code practice

2
2.2

grep and find: Searching Like a Pro

grep searches INSIDE files for matching text; find searches the FILESYSTEM for matching files — two different kinds of search that together cover almost everything you'll ever need to locate.

13 min 1 code practice

3
2.3

sed and awk for Real Work

sed transforms text line by line (a 'find and replace' engine); awk processes text COLUMN by column — together they cover text transformation tasks grep alone can't handle.

13 min 1 code practice

4
2.4

Sorting, Counting, and Combining

sort, uniq, wc, and cut are small enough to feel almost trivial individually, but combined in a pipeline they answer real questions — like 'what are the top 5 most frequent values in this file' — with zero code written.

14 min 1 code practice