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     grep - search a file for a pattern

     grep [ -v ] [ -b ] [ -c ] [ -n ] expression [ file ] ...

     Grep searches the input files (standard input default) for
     lines matching the regular expression.  Normally, each line
     found is copied to the standard output.  If the -v flag is
     used, all lines but those matching are printed.  If the -c
     flag is used, only a count of matching lines is printed.  If
     the -n flag is used, each line is preceded its relative line
     number in the file.  If the -b flag is used, each line is
     preceded by the block number on which it was found.  This is
     sometimes useful in locating disk block numbers by context.

     In all cases the file name is shown if there is more than
     one input file.

     For a complete description of the regular expression, see ed
     (I).  Care should be taken when using the characters $ * [ ^
     | ( ) and \ in the regular expression as they are also mean-
     ingful to the Shell.  It is generally necessary to enclose
     the entire expression argument in quotes.

     ed (I), sh (I)

     Lines are limited to 256 characters; longer lines are trun-