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GREP(1)			   OpenBSD Reference Manual		       GREP(1)

NAME
     grep, egrep, fgrep, zgrep, zegrep, zfgrep - file pattern searcher

SYNOPSIS
     grep [-abcEFGhIiLlnqRsUVvwxZ] [-A num] [-B num] [-C[num]] [-e pattern]
	  [-f file] [--binary-files=value] [--context[=num]] [--line-buffered]
	  [pattern] [file ...]

DESCRIPTION
     The grep utility searches any given input files, selecting lines that
     match one or more patterns.  By default, a pattern matches an input line
     if the regular expression (RE) in the pattern matches the input line
     without its trailing newline.  An empty expression matches every line.
     Each input line that matches at least one of the patterns is written to
     the standard output.  If no file arguments are specified, the standard
     input is used.

     grep is used for simple patterns and basic regular expressions (BREs);
     egrep can handle extended regular expressions (EREs).  See re_format(7)
     for more information on regular expressions.  fgrep is quicker than both
     grep and egrep, but can only handle fixed patterns (i.e. it does not
     interpret regular expressions).  Patterns may consist of one or more
     lines, allowing any of the pattern lines to match a portion of the input.

     zgrep, zegrep, and zfgrep act like grep, egrep, and fgrep, respectively,
     but accept input files compressed with the compress(1) or gzip(1)
     compression utilities.

     The following options are available:

     -A num  Print num lines of trailing context after each match.  See also
	     the -B and -C options.

     -a	     Treat all files as ASCII text.  Normally grep will simply print
	     ``Binary file ... matches'' if files contain binary characters.
	     Use of this option forces grep to output lines matching the
	     specified pattern.

     -B num  Print num lines of leading context before each match.  See also
	     the -A and -C options.

     -b	     The offset in bytes of a matched pattern is displayed in front of
	     the respective matched line.

     -C[num]
	     Print num lines of leading and trailing context surrounding each
	     match.  The default is 2 and is equivalent to -A 2 -B 2.  Note:
	     no whitespace may be given between the option and its argument.

     -c	     Only a count of selected lines is written to standard output.

     -E	     Interpret pattern as an extended regular expression (i.e. force
	     grep to behave as egrep).

     -e pattern
	     Specify a pattern used during the search of the input: an input
	     line is selected if it matches any of the specified patterns.
	     This option is most useful when multiple -e options are used to
	     specify multiple patterns, or when a pattern begins with a dash
	     (`-').

     -F	     Interpret pattern as a set of fixed strings (i.e. force grep to
	     behave as fgrep).

     -f file
	     Read one or more newline separated patterns from file.  Empty
	     pattern lines match every input line.  Newlines are not
	     considered part of a pattern.  If file is empty, nothing is
	     matched.

     -G	     Interpret pattern as a basic regular expression (i.e. force grep
	     to behave as traditional grep).

     -h	     Never print filename headers (i.e. filenames) with output lines.

     -I	     Ignore binary files.

     -i	     Perform case insensitive matching.	 By default, grep is case
	     sensitive.

     -L	     Only the names of files not containing selected lines are written
	     to standard output.  Pathnames are listed once per file searched.
	     If the standard input is searched, the string ``(standard
	     input)'' is written.

     -l	     Only the names of files containing selected lines are written to
	     standard output.  grep will only search a file until a match has
	     been found, making searches potentially less expensive.
	     Pathnames are listed once per file searched.  If the standard
	     input is searched, the string ``(standard input)'' is written.

     -n	     Each output line is preceded by its relative line number in the
	     file, starting at line 1.	The line number counter is reset for
	     each file processed.  This option is ignored if -c, -L, -l, or -q
	     is specified.

     -q	     Quiet mode: suppress normal output.  grep will only search a file
	     until a match has been found, making searches potentially less
	     expensive.

     -R	     Recursively search subdirectories listed.

     -s	     Silent mode.  Nonexistent and unreadable files are ignored (i.e.
	     their error messages are suppressed).

     -U	     Search binary files, but do not attempt to print them.

     -V	     Display version information.  All other options are ignored.

     -v	     Selected lines are those not matching any of the specified
	     patterns.

     -w	     The expression is searched for as a word (as if surrounded by
	     `[[:<:]]' and `[[:>:]]'; see re_format(7)).

     -x	     Only input lines selected against an entire fixed string or
	     regular expression are considered to be matching lines.

     -Z	     Force grep to behave as zgrep.

     --binary-files=value
	     Controls searching and printing of binary files.  Options are
	     binary, the default: search binary files but do not print them;
	     without-match: do not search binary files; and text: treat all
	     files as text.

     --context[=num]
	     Print num lines of leading and trailing context.  The default is
	     2.

     --line-buffered
	     Force output to be line buffered.	By default, output is line
	     buffered when standard output is a terminal and block buffered
	     otherwise.

EXIT STATUS
     The grep utility exits with one of the following values:

	   0	   One or more lines were selected.
	   1	   No lines were selected.
	   >1	   An error occurred.

EXAMPLES
     To find all occurrences of the word `patricia' in a file:

	   $ grep 'patricia' myfile

     To find all occurrences of the pattern `.Pp' at the beginning of a line:

	   $ grep '^\.Pp' myfile

     The apostrophes ensure the entire expression is evaluated by grep instead
     of by the user's shell.  The caret `^' matches the null string at the
     beginning of a line, and the `\' escapes the `.', which would otherwise
     match any character.

     To find all lines in a file which do not contain the words `foo' or
     `bar':

	   $ grep -v -e 'foo' -e 'bar' myfile

     A simple example of an extended regular expression:

	   $ egrep '19|20|25' calendar

     Peruses the file `calendar' looking for either 19, 20, or 25.

SEE ALSO
     ed(1), ex(1), gzip(1), sed(1), re_format(7)

STANDARDS
     The grep utility is compliant with the IEEE Std 1003.1-2008 (``POSIX'')
     specification.

     The flags [-AaBbCGhILRUVwZ] are extensions to that specification, and the
     behaviour of the -f flag when used with an empty pattern file is left
     undefined.

     All long options are provided for compatibility with GNU versions of this
     utility.

     Historic versions of the grep utility also supported the flags [-ruy].
     This implementation supports those options; however, their use is
     strongly discouraged.

HISTORY
     The grep command first appeared in Version 6 AT&T UNIX.

OpenBSD 4.9		       September 3, 2010		   OpenBSD 4.9
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