You will learn
- what a filter is: a command that reads files or
stdin, changes the text and writes it to stdout
- how to look at and change text with
cat, sort, uniq, wc, head, tail, tac, rev, nl, cut and tr
- what a regular expression is and how
grep uses it to find lines (-E, -n, -c, -v, -o, -q)
- how to chain filters into a pipeline with
| to answer a question in one line
- what the exit code of a command is, why
0 means success, and how to chain commands with && and ||
Slides
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