18 lines
893 B
Markdown
18 lines
893 B
Markdown
FreeGrep
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========
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The grep utility searches any given input files, selecting lines
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that match one or more patterns. By default, a pattern matches an
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input line if the regular expression in the pattern matches the
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input line without its trailing newline. An empty expression matches
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every line. Each input line that matches at least one of the patterns
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is written to the standard output. grep is used for simple patterns
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and basic regular expressions; egrep can handle extended regular
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expressions. fgrep is quicker than both grep and egrep, but can
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only handle fixed patterns (i.e. it does not interpret regular
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expressions). Patterns may consist of one or more lines, allowing
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any of the pattern lines to match a portion of the input. zgrep,
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zegrep, and zfgrep act like grep, egrep, and fgrep, respectively,
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but accept input files compressed with the compress or gzip compression
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utilities.
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