GREP(1plan9)                                                      GREP(1plan9)

       grep, g - search a file for a pattern

       grep [ option ...  ] pattern [ file ...  ]

       g [ option ...  ] pattern [ file ...  ]

       Grep searches the input files (standard input default) for lines that
       match the pattern, a regular expression as defined in regexp(7) 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

       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.

       G invokes grep with -n and forces tagging of output lines by file name.
       If no files are listed, it searches all files matching

              *.C *.b *.c *.h *.m *.cc *.java *.cgi *.pl *.py *.tex *.ms


       ed(1), awk(1), sed(1), sam(1), regexp(7)

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