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egrep(1)                         User Commands                        egrep(1)



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

SYNOPSIS
       /usr/bin/egrep   [-bchilnsv]   [-e pattern_list]   [-f file]  [strings]
       [file...]

       /usr/xpg4/bin/egrep [-bchilnsvx] [-e pattern_list] [-f file]  [strings]
       [file...]

DESCRIPTION
       The  egrep  (expression  grep)  utility 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  pat-
       terns.  It  uses  a  fast  deterministic algorithm that sometimes needs
       exponential space.

       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.

   /usr/bin/egrep
       The  /usr/bin/egrep  utility  accepts  full  regular   expressions   as
       described  on  the  regexp(5) manual page, except for \( and \), \( and
       \), \{ and \}, \<&lt; and \>&gt;, and \n, 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 occur-
           rences of the full regular expression.


       3.  Full regular expressions separated by | or by a NEWLINE 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 reg-
       ular  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 concatena-
       tion, then | and NEWLINE.

   /usr/xpg4/bin/egrep
       The /usr/xpg4/bin/egrep utility uses the regular expressions  described
       in  the  EXTENDED  REGULAR  EXPRESSIONS  section of the regex(5) manual
       page.

OPTIONS
       The  following  options  are  supported  for  both  /usr/bin/egrep  and
       /usr/xpg4/bin/egrep:

       -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 pat-
                       tern.



       -e pattern_list Search for a pattern_list (full regular expression that
                       begins with a -).



       -f file         Take the list of full regular expressions from file.



       -h              Suppress  printing of filenames when searching multiple
                       files.



       -i              Ignore upper/lower case distinction during comparisons.



       -l              Print the names of files with matching lines once, sep-
                       arated  by NEWLINEs. Does not repeat the names of files
                       when the pattern is found more than once.



       -n              Precede each line by its line number in the file (first
                       line is 1).



       -s              Work  silently,  that  is, display nothing except error
                       messages. This is useful for checking the error status.



       -v              Print all lines except those that contain the pattern.



   /usr/xpg4/bin/egrep
       The following option is supported for /usr/xpg4/bin/egrep only:

       -x       Consider only input lines that use all characters in the  line
                to  match  an  entire fixed string or regular expression to be
                matching lines.



OPERANDS
       The following operands are supported:

       file            A path name of a file to be searched for the  patterns.
                       If  no  file operands are specified, the standard input
                       will be used.



   /usr/bin/egrep
       pattern         Specify a pattern to be  used  during  the  search  for
                       input.



   /usr/xpg4/bin/egrep
       pattern         Specify  one  or  more  patterns  to be used during the
                       search for input. This operand is treated as if it were
                       specified as -epattern_list.



USAGE
       See  largefile(5)  for  the  description  of the behavior of egrep when
       encountering files greater than or equal to 2 Gbyte ( 2**31 bytes).

ENVIRONMENT VARIABLES
       See environ(5) for descriptions of the following environment  variables
       that  affect the execution of egrep: LC_COLLATE, LC_CTYPE, LC_MESSAGES,
       and NLSPATH.

EXIT STATUS
       The following exit values are returned:

       0        If any matches are found.



       1        If no matches are found.



       2        For syntax errors or inaccessible files (even if matches  were
                found).



ATTRIBUTES
       See attributes(5) for descriptions of the following attributes:

   /usr/bin/egrep
       tab()     allbox;     cw(2.750000i)|    cw(2.750000i)    lw(2.750000i)|
       lw(2.750000i).   ATTRIBUTE  TYPEATTRIBUTE   VALUE   AvailabilitySUNWcsu
       CSIenabled


   /usr/xpg4/bin/egrep
       tab()     allbox;     cw(2.750000i)|    cw(2.750000i)    lw(2.750000i)|
       lw(2.750000i).   ATTRIBUTE  TYPEATTRIBUTE  VALUE   AvailabilitySUNWxcu4
       CSIenabled


SEE ALSO
       fgrep(1),  grep(1),  sed(1),  sh(1),  attributes(5), environ(5), large-
       file(5), regex(5), regexp(5), XPG4(5)

NOTES
       Ideally there should be only one grep command, but there is not a  sin-
       gle algorithm that spans a wide enough range of space-time tradeoffs.

       Lines are limited only by the size of the available virtual memory.

   /usr/xpg4/bin/egrep
       The  /usr/xpg4/bin/egrep  utility is identical to /usr/xpg4/bin/grep -E
       (see grep(1)). Portable applications should use /usr/xpg4/bin/grep -E.



SunOS 5.10                        12 May 1997                         egrep(1)