Linux › Section B · Basic commands and the directory hierarchy › Topic B.4
Intermediate commands: grep, less, diff, find, sort
Once you can move around and manage files, the next step is finding things: lines in a log, a file lost somewhere in a tree, the change between two versions. This topic covers the standard tools for searching, viewing, comparing and counting text, with a short primer on regular expressions.
In this topic
- Tools that work on text
- grep: finding matching lines
- A short regular-expression primer
- Basic and extended regular expressions
- Worked example: searching a log
- less, head and tail
- diff and file
- find, locate and pwd -P
- sort, cut, uniq, wc and tr
- Worked example: counting log levels
- Common mistakes to avoid
- Key takeaways
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