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grep(1)

grep(1)                          User Commands                         grep(1)



NAME
       grep - search a file for a pattern

SYNOPSIS
       /usr/bin/grep [-c | -l | -q] [-bhinsvw] limited-regular-expression
            [filename]...


       /usr/xpg4/bin/grep [-E | -F] [-c | -l | -q] [-bhinsvx] -e pattern_list...
            [-f pattern_file]... [file]...


       /usr/xpg4/bin/grep [-E | -F] [-c | -l | -q] [-bhinsvx]
            [-e pattern_list]... -f pattern_file... [file]...


       /usr/xpg4/bin/grep [-E | -F] [-c | -l | -q] [-bhinsvx] pattern
            [file]...

DESCRIPTION
       The grep utility searches text files for a pattern and prints all lines
       that contain that pattern. It uses a  compact  non-deterministic  algo‐
       rithm.


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


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

   /usr/bin/grep
       The  /usr/bin/grep  utility uses limited regular expressions like those
       described on the regexp(7) manual page to match the patterns.

   /usr/xpg4/bin/grep
       The      options      -E      and      -F      affect      the      way
       /usr/xpg4/bin/grep   interprets   pattern_list.  If  -E  is  specified,
       /usr/xpg4/bin/grep interprets                          pattern_list  as
       a full regular expression (see -E for description). If -F is specified,
       grep interprets pattern_list as a fixed string. If neither  are  speci‐
       fied,   grep  interprets  pattern_list as a basic regular expression as
       described on regex(7) manual page.

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

       -b    Precedes  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    Prints only a count of the lines that contain the pattern.


       -h    Prevents  the  name of the file containing the matching line from
             being prepended to that line. Used when searching multiple files.


       -i    Ignores upper/lower case distinction during comparisons.


       -l    Prints only the names of files with matching lines, separated  by
             NEWLINE  characters.  Does not repeat the names of files when the
             pattern is found more than once.


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


       -q    Quiet. Does not write anything to the standard output, regardless
             of matching lines. Exits with zero status if  an  input  line  is
             selected.


       -s    Suppresses error messages about non-existent or unreadable files.


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


       -w    Searches  for the expression as a word as if surrounded by \< and
             \>.


   /usr/xpg4/bin/grep
       The following options are supported for /usr/xpg4/bin/grep only:

       -e pattern_list    Specifies one or more patterns to be used during the
                          search  for  input. Patterns in pattern_list must be
                          separated by a NEWLINE character. A null pattern can
                          be  specified  by two adjacent newline characters in
                          pattern_list. Unless the -E or  -F  option  is  also
                          specified,  each pattern is treated as a basic regu‐
                          lar expression.  Multiple  -e  and  -f  options  are
                          accepted  by grep. All of the specified patterns are
                          used when matching lines, but the order  of  evalua‐
                          tion is unspecified.


       -E                 Matches  using full regular expressions. Treats each
                          pattern specified as a full regular  expression.  If
                          any  entire  full regular expression pattern matches
                          an input line, the line is matched. A null full reg‐
                          ular  expression matches every line. Each pattern is
                          interpreted  as  a  full   regular   expression   as
                          described on the regex(7) manual page, except for \(
                          and \), and including:


                              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   is
                                     enclosed in parentheses () for grouping.


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


       -f pattern_file    Reads one or more patterns from the  file  named  by
                          the path name pattern_file. Patterns in pattern_file
                          are terminated by a NEWLINE character. A  null  pat‐
                          tern  can  be  specified  by  an  empty line in pat‐
                          tern_file. Unless the -E or -F option is also speci‐
                          fied,  each  pattern  is  treated as a basic regular
                          expression.


       -F                 Matches using fixed  strings.  Treats  each  pattern
                          specified  as  a string instead of a regular expres‐
                          sion. If an input line contains any of the  patterns
                          as  a  contiguous  sequence  of  bytes,  the line is
                          matched. A  null  string  matches  every  line.  See
                          fgrep(1) for more information.


       -x                 Considers  only  input lines that use all characters
                          in the line to match an entire fixed string or regu‐
                          lar 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 is used.


   /usr/bin/grep
       pattern    Specifies a pattern to be used during the search for input.


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


USAGE
       The -c, -l and -q options are mutually exclusive. If specified together
       -q overrides -c which overrides -l.


       The -e  pattern_list option has the same effect as the pattern_list op‐
       erand, but is useful when pattern_list begins with  the  hyphen  delim‐
       iter.  It is also useful when it is more convenient to provide multiple
       patterns as separate arguments.


       Multiple -e and -f options are accepted and grep uses all of  the  pat‐
       terns  it  is  given  while  matching input text lines. Notice that the
       order of evaluation is not specified. If an implementation finds a null
       string  as a pattern, it is allowed to use that pattern first, matching
       every line, and effectively ignore any other patterns.


       The -q option provides a means of easily determining whether or  not  a
       pattern  (or string) exists in a group of files. When searching several
       files, it provides a performance improvement (because it  can  quit  as
       soon as it finds the first match) and requires less care by the user in
       choosing the set of files to supply as arguments (because it exits zero
       if  it  finds  a match even if grep detected an access or read error on
       earlier file operands).

EXAMPLES
       Example 1 Finding All Uses of a Word



       To find all uses of the word "Posix" (in any case) in the file text.mm,
       and write with line numbers:


         example% /usr/bin/grep -i -n posix text.mm



       Example 2 Finding All Empty Lines



       To find all empty lines in the standard input:


         example% /usr/bin/grep ^$




       or


         example% /usr/bin/grep -v .



       Example 3 Finding Lines Containing Strings



       All  of  the  following commands print all lines containing strings abc
       or def or both:


         example% /usr/xpg4/bin/grep 'abc
         def'
         example% /usr/xpg4/bin/grep -e 'abc
         def'
         example% /usr/xpg4/bin/grep -e 'abc' -e 'def'
         example% /usr/xpg4/bin/grep -E 'abc|def'
         example% /usr/xpg4/bin/grep -E -e 'abc|def'
         example% /usr/xpg4/bin/grep -E -e 'abc' -e 'def'
         example% /usr/xpg4/bin/grep -E 'abc
         def'
         example% /usr/xpg4/bin/grep -E -e 'abc
         def'
         example% /usr/xpg4/bin/grep -F -e 'abc' -e 'def'
         example% /usr/xpg4/bin/grep -F 'abc
         def'
         example% /usr/xpg4/bin/grep -F -e 'abc
         def'



       Example 4 Finding Lines with Matching Strings



       Both of the following commands print all lines matching exactly abc  or
       def:


         example% /usr/xpg4/bin/grep -E '^abc$ ^def$'
         example% /usr/xpg4/bin/grep -F -x 'abc def'



ENVIRONMENT VARIABLES
       See  environ(7) for descriptions of the following environment variables
       that affect the execution of grep: LANG, LC_ALL, LC_COLLATE,  LC_CTYPE,
       LC_MESSAGES, and NLSPATH.

EXIT STATUS
       The following exit values are returned:

       0    One or more matches were found.


       1    No matches were found.


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


ATTRIBUTES
       See attributes(7) for descriptions of the following attributes:

   /usr/bin/grep
       tab()  box; cw(2.75i) |cw(2.75i) lw(2.75i) |lw(2.75i) ATTRIBUTE TYPEAT‐
       TRIBUTE VALUE _ Availabilitysystem/core-os _ CSINot Enabled


   /usr/xpg4/bin/grep
       tab() box; cw(2.75i) |cw(2.75i) lw(2.75i) |lw(2.75i) ATTRIBUTE  TYPEAT‐
       TRIBUTE  VALUE _ Availabilitysystem/xopen/xcu4 _ CSIEnabled _ Interface
       StabilityCommitted _ StandardSee standards(7).


SEE ALSO
       egrep(1), fgrep(1), sed(1), sh(1), attributes(7), environ(7), regex(7),
       regexp(7), standards(7)

NOTES
   /usr/bin/grep
       Lines  are limited only by the size of the available virtual memory. If
       there is a line with embedded nulls, grep only matches up to the  first
       null. If the line matches, the entire line is printed.

   /usr/xpg4/bin/grep
       The  results  are  unspecified if input files contain lines longer than
       LINE_MAX  bytes  or  contain  binary  data.  LINE_MAX  is  defined   in
       /usr/include/limits.h.



Oracle Solaris 11.4              29 Sept 2016                          grep(1)
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