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Grep Overall Description
The grep utility searches files for a pattern and prints all lines that
contain that pattern. It uses a compact non-deterministic algorithm.
Be careful using the characters $, *, [, ^, |, (, ), and \ in the pattern_list
because they are also meaningful to the shell. It is safest to enclose
the entire pattern_list in single quotes ‘... ‘.
If no files are specified, grep assumes standard input. Normally, each
line found is copied to standard output. The file name is printed before
each line found if there is more than one input file.
/usr/bin/grep
The /usr/bin/grep utility uses limited regular expressions
like those described on the regexp(5) manual page to match the patterns.
/usr/xpg4/bin/grep
The options -E and -F affect the way /usr/xpg4/bin/grep interprets
pattern_list. If -E is specified, /usr/xpg4/bin/grep interprets pattern_list
as a full regular expression (see -E for description). If -F is specified,
grep interprets pattern_list as a fixed string. If neither are specified,
grep interprets pattern_list as a basic regular expression as described
on regex(5) manual page.
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