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Debian GNU/Linux Reference Guide
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4.4 Unix-like text processing

There are few standard text processing tools which are used very often on the Unix-like system.

  • No regular expression is used:

    • head outputs the first part of files.

    • tail outputs the last part of files.

    • sort sorts lines of text files.

    • uniq removes duplicate lines from a sorted file.

    • tr translates or deletes characters.

    • diff compares files line by line.

  • Basic regular expression (BRE) is used:

    • grep matches text with the pattern.

    • ed is a primitive line editor.

    • sed is a stream editor.

    • vi is a screen editor.

    • emacs is a screen editor.

  • Extended regular expression (ERE) is used:

See Regular-expression substitution, Section 8.6.13, Script snippets for piping commands, Section 8.6.18, and Perl short script madness, Section 8.6.20 for some script examples.

Debian GNU/Linux Reference Guide
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