egrep(1)         (Directory and File Management Utilities)         egrep(1)


   NAME
         egrep - search a file for a pattern using full regular expressions

   SYNOPSIS
         egrep [options] full regular expression [file ...]

   DESCRIPTION
         egrep (expression grep) searches files for a pattern of characters
         and prints all lines that contain that pattern.  egrep uses full
         regular expressions (expressions that have string values that use the
         full set of alphanumeric and special characters) to match the
         patterns.  It uses a fast deterministic algorithm that sometimes
         needs exponential space.

         egrep accepts full regular expressions as in ed(1), except for \( and
         \), with the addition of:

         1.    A full regular expression followed by + that matches one or
               more occurrences of the full regular expression.
         2.    A full regular expression followed by ?  that matches 0 or 1
               occurrences of the full regular expression.
         3.    Full regular expressions separated by | or by a new-line that
               match strings that are matched by any of the expressions.
         4.    A full regular expression that may be enclosed in parentheses
               () for grouping.

         Be careful using the characters $, *, [, ^, |, (, ), and \ in full
         regular expression, because they are also meaningful to the shell.
         It is safest to enclose the entire full regular expression in single
         quotes '...'.

         The order of precedence of operators is [], then *?+, then
         concatenation, then | and new-line.

         If no files are specified, egrep assumes standard input.  Normally,
         each line found is copied to the standard output.  The file name is
         printed before each line found if there is more than one input file.

         Command line options are:

         -b    Precede each line by the block number on which it was found.
               This can be useful in locating block numbers by context (first
               block is 0).
         -c    Print only a count of the lines that contain the pattern.
         -i    Ignore upper/lower case distinction during comparisons.
         -h    Suppress printing of filenames when searching multiple files.
         -l    Print the names of files with matching lines once, separated by
               new-lines.  Does not repeat the names of files when the pattern
               is found more than once.




   7/91                                                                 Page 1

   egrep(1)         (Directory and File Management Utilities)         egrep(1)


         -n    Precede each line by its line number in the file (first line is
               1).
         -v    Print all lines except those that contain the pattern.
         -e special_expression
               Search for a special expression (full regular expression that
               begins with a -).
         -f file
               Take the list of full regular expressions from file.

   SEE ALSO
         ed(1), fgrep(1), grep(1), sed(1), sh(1).

   DIAGNOSTICS
         Exit status is 0 if any matches are found, 1 if none, 2 for syntax
         errors or inaccessible files (even if matches were found).

   NOTES
         Ideally there should be only one grep command, but there is not a
         single algorithm that spans a wide enough range of space-time
         tradeoffs.  Lines are limited to BUFSIZ characters; longer lines are
         truncated.  BUFSIZ is defined in /usr/include/stdio.h.
































   Page 2                                                                 7/91