WHAT(1P)                                            POSIX Programmer's Manual                                           WHAT(1P)



PROLOG
       This  manual  page is part of the POSIX Programmer's Manual.  The Linux implementation of this interface may differ (con-
       sult the corresponding Linux manual page for details of Linux behavior), or the  interface  may  not  be  implemented  on
       Linux.

NAME
       what - identify SCCS files (DEVELOPMENT)

SYNOPSIS
       what [-s] file...

DESCRIPTION
       The  what utility shall search the given files for all occurrences of the pattern that get (see get ) substitutes for the
       %Z% keyword ( "@(#)" ) and shall write to standard output what follows until the first occurrence of one of  the  follow-
       ing:


              "   >   newline   \   NUL

OPTIONS
       The  what  utility  shall  conform  to  the Base Definitions volume of IEEE Std 1003.1-2001, Section 12.2, Utility Syntax
       Guidelines.

       The following option shall be supported:

       -s     Quit after finding the first occurrence of the pattern in each file.


OPERANDS
       The following operands shall be supported:

       file   A pathname of a file to search.


STDIN
       Not used.

INPUT FILES
       The input files shall be of any file type.

ENVIRONMENT VARIABLES
       The following environment variables shall affect the execution of what:

       LANG   Provide a default value for the internationalization variables that are unset or null. (See the  Base  Definitions
              volume  of  IEEE Std 1003.1-2001, Section 8.2, Internationalization Variables for the precedence of international-
              ization variables used to determine the values of locale categories.)

       LC_ALL If set to a non-empty string value, override the values of all the other internationalization variables.

       LC_CTYPE
              Determine the locale for the interpretation of sequences of bytes of text data as characters (for example, single-
              byte as opposed to multi-byte characters in arguments and input files).

       LC_MESSAGES
              Determine the locale that should be used to affect the format and contents of diagnostic messages written to stan-
              dard error.

       NLSPATH
              Determine the location of message catalogs for the processing of LC_MESSAGES .


ASYNCHRONOUS EVENTS
       Default.

STDOUT
       The standard output shall consist of the following for each file operand:


              "%s:\n\t%s\n", <pathname>, <identification string>

STDERR
       The standard error shall be used only for diagnostic messages.

OUTPUT FILES
       None.

EXTENDED DESCRIPTION
       None.

EXIT STATUS
       The following exit values shall be returned:

       0      Any matches were found.

       1      Otherwise.


CONSEQUENCES OF ERRORS
       Default.

       The following sections are informative.

APPLICATION USAGE
       The what utility is intended to be used in conjunction with the SCCS command get, which automatically inserts identifying
       information, but it can also be used where the information is inserted by any other means.

       When the string "@(#)" is included in a library routine in a shared library, it might not be found in an a.out file using
       that library routine.

EXAMPLES
       If the C-language program in file f.c contains:


              char ident[] = "@(#)identification information";

       and f.c is compiled to yield f.o and a.out, then the command:


              what f.c f.o a.out

       writes:


              f.c:
                  identification information
                  ...
              f.o:
                  identification information
                  ...
              a.out:
                  identification information
                  ...

RATIONALE
       None.

FUTURE DIRECTIONS
       None.

SEE ALSO
       get

COPYRIGHT
       Portions of this text are reprinted and reproduced in electronic form from IEEE Std 1003.1, 2003  Edition,  Standard  for
       Information  Technology -- Portable Operating System Interface (POSIX), The Open Group Base Specifications Issue 6, Copy-
       right (C) 2001-2003 by the Institute of Electrical and Electronics Engineers, Inc and The Open Group. In the event of any
       discrepancy  between this version and the original IEEE and The Open Group Standard, the original IEEE and The Open Group
       Standard  is  the  referee   document.   The   original   Standard   can   be   obtained   online   at   http://www.open-
       group.org/unix/online.html .



IEEE/The Open Group                                           2003                                                      WHAT(1P)