PROLOG | NAME | SYNOPSIS | DESCRIPTION | OPTIONS | OPERANDS | STDIN | INPUT FILES | ENVIRONMENT VARIABLES | ASYNCHRONOUS EVENTS | STDOUT | STDERR | OUTPUT FILES | EXTENDED DESCRIPTION | EXIT STATUS | CONSEQUENCES OF ERRORS | APPLICATION USAGE | EXAMPLES | RATIONALE | FUTURE DIRECTIONS | SEE ALSO | COPYRIGHT

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

PROLOG         top

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

NAME         top

       what — identify SCCS files (DEVELOPMENT)

SYNOPSIS         top

       what [−s] file...

DESCRIPTION         top

       The what utility shall search the given files for all occurrences of
       the pattern that get (see get(1p)) substitutes for the %Z% keyword
       ("@(#)") and shall write to standard output what follows until the
       first occurrence of one of the following:

           "   >   newline   \   NUL

OPTIONS         top

       The what utility shall conform to the Base Definitions volume of
       POSIX.1‐2008, 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         top

       The following operands shall be supported:

       file      A pathname of a file to search.

STDIN         top

       Not used.

INPUT FILES         top

       The input files shall be of any file type.

ENVIRONMENT VARIABLES         top

       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 POSIX.1‐2008, Section 8.2, Internationalization
                 Variables for the precedence of internationalization
                 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
                 standard error.

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

ASYNCHRONOUS EVENTS         top

       Default.

STDOUT         top

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

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

STDERR         top

       The standard error shall be used only for diagnostic messages.

OUTPUT FILES         top

       None.

EXTENDED DESCRIPTION         top

       None.

EXIT STATUS         top

       The following exit values shall be returned:

       0     Any matches were found.

       1     Otherwise.

CONSEQUENCES OF ERRORS         top

       Default.

       The following sections are informative.

APPLICATION USAGE         top

       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         top

       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         top

       None.

FUTURE DIRECTIONS         top

       None.

SEE ALSO         top

       get(1p)

       The Base Definitions volume of POSIX.1‐2008, Chapter 8, Environment
       Variables, Section 12.2, Utility Syntax Guidelines

COPYRIGHT         top

       Portions of this text are reprinted and reproduced in electronic form
       from IEEE Std 1003.1, 2013 Edition, Standard for Information
       Technology -- Portable Operating System Interface (POSIX), The Open
       Group Base Specifications Issue 7, Copyright (C) 2013 by the
       Institute of Electrical and Electronics Engineers, Inc and The Open
       Group.  (This is POSIX.1-2008 with the 2013 Technical Corrigendum 1
       applied.) 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.unix.org/online.html .

       Any typographical or formatting errors that appear in this page are
       most likely to have been introduced during the conversion of the
       source files to man page format. To report such errors, see
       https://www.kernel.org/doc/man-pages/reporting_bugs.html .

IEEE/The Open Group                 2013                            WHAT(1P)