glenda.party
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GREP(1)                     General Commands Manual                    GREP(1)



NAME
       grep - search a file for a pattern

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

DESCRIPTION
       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 in‐
              terpretation.  Matched lines are printed in their original form.
       -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
              -l.
       -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
              discovered.

       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‐
       ment.)

       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.

SOURCE
       /sys/src/cmd/grep

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

DIAGNOSTICS
       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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