xenial (1) what.1posix.gz

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PROLOG
       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
       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 following:

           "   >   newline   \   NUL


OPTIONS
       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
       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 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
       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

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


       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 .