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Advanced Text Processing

Build complex pipelines with head, tail, grep, and wc for multi-stage text processing.

Step 1

Review: pipe cat output through grep to find ERROR lines.

Type: cat documents/log.txt | grep ERROR

cat documents/log.txt | grep ERROR

Step 2

Pipe the log file to head to see only the first 3 lines.

Step 3

Extract lines 4-5: pipe through head -n 5 then tail -n 2.

Step 4

Count INFO lines using a 3-stage pipeline: cat | grep | wc.

Step 5

Use ls | grep to filter directory listing for "txt" files.

Step 6

Count how many txt files are in documents.

Step 7

Use grep -n in a pipe to find WARN lines with line numbers.

Step 8

Count non-INFO lines using grep -v in a pipeline.

Step 9

Save pipeline output to a file: pipe grep results to errors.txt.