grep man page on Plan9

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GREP(1)								       GREP(1)

       grep - search a file for a pattern

       grep [ -bchiLlnsv ] [ -e ] pattern | -f patternfile [ file ...  ]

       Grep  searches  the input files (standard input default) for lines that
       match the pattern, a regular expression as defined  in  regexp(6)  with
       the  addition  of a newline character as an alternative (substitute for
       |) with lowest precedence.  Normally, each line matching the pattern is
       `selected',  and	 each  selected line is copied to the standard output.
       The options are

       -c     Print only a count of matching lines.
       -h     Do not print file name tags (headers) with output lines.
       -e     The following argument is taken as a pattern.  This option makes
	      it easy to specify patterns that might confuse argument parsing,
	      such as -n.
       -i     Ignore alphabetic case distinctions.  The	 implementation	 folds
	      into  lower  case	 all  letters  in the pattern and input before
	      interpretation.  Matched lines are  printed  in  their  original
       -l     (ell)  Print the names of files with selected lines; don't print
	      the lines.
       -L     Print the names of files with no selected lines; the converse of
       -n     Mark each printed line with its line number counted in its file.
       -s     Produce no output, but return status.
       -v     Reverse: print lines that do not match the pattern.
       -f     The  pattern  argument  is the name of a file containing regular
	      expressions one per line.
       -b     Don't buffer the output: write each output line as soon as it is

       Output  lines are tagged by file name when there is more than one input
       file.  (To force this tagging, include /dev/null as a file  name	 argu‐

       Care  should be taken when using the shell metacharacters $*[^|()=\ and
       newline in pattern; it is safest to enclose the	entire	expression  in
       single  quotes  '...'.	An expression starting with '*' will treat the
       rest of the expression as literal characters.


       ed(1), awk(1), sed(1), sam(1), regexp(6)

       Exit status is null if any lines are  selected,	or  non-null  when  no
       lines are selected or an error occurs.

                             _         _         _ 
                            | |       | |       | |     
                            | |       | |       | |     
                         __ | | __ __ | | __ __ | | __  
                         \ \| |/ / \ \| |/ / \ \| |/ /  
                          \ \ / /   \ \ / /   \ \ / /   
                           \   /     \   /     \   /    
                            \_/       \_/       \_/ 
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