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Text Processing · medium

3. Pipes, Redirection, and Text Processing (grep, sed, awk)

Stream filtering and report generation.

1 min read2 questionsup to 50 XPtopic 3/4

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AI translates the explanation and quiz text while preserving code and answer scoring.

- Standard streams: `stdin` (0), `stdout` (1), `stderr` (2). - Redirection: `>` (overwrite), `>>` (append), `2>&1` (merge stderr into stdout). - `grep -E "pattern"`: Regex search. - `awk '{print $1}'`: Column processing. - `sed 's/old/new/g'`: Stream replacement.

How to study this topic

1. Read the explanation once end to end, skipping the code.
2. Re-read the code snippets and say out loud what each line does.
3. Answer the quiz without scrolling back — that is the real check.
4. Read every explanation, even for the answers you got right.

Scoring

· Up to 30 XP from quiz accuracy.
· +15 XP for a perfect first attempt.
· +5 XP while a 3-day streak is running.
· 75% or higher marks the topic complete.

Check your understanding

1. How do you redirect both stdout and stderr of a command to a log file?
command > output.log 2>&1 (or &> output.log)command 2> output.logcommand | output.logcommand >> 2
2. Which tool is standard for column slicing and table aggregation in Bash pipelines?
awkcatechotouch

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