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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 |
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WHAT(1P) POSIX Programmer's Manual WHAT(1P)
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.
what — identify SCCS files (DEVELOPMENT)
what [-s] file...
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
The what utility shall conform to the Base Definitions volume of
POSIX.1‐2017, 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.
The following operands shall be supported:
file A pathname of a file to search.
Not used.
The input files shall be of any file type.
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.1‐2017, 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.
Default.
The standard output shall consist of the following for each file
operand:
"%s:\n\t%s\n", <pathname>, <identification string>
The standard error shall be used only for diagnostic messages.
None.
None.
The following exit values shall be returned:
0 Any matches were found.
1 Otherwise.
Default.
The following sections are informative.
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.
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
...
None.
None.
get(1p)
The Base Definitions volume of POSIX.1‐2017, Chapter 8,
Environment Variables, Section 12.2, Utility Syntax Guidelines
Portions of this text are reprinted and reproduced in electronic
form from IEEE Std 1003.1-2017, Standard for Information
Technology -- Portable Operating System Interface (POSIX), The
Open Group Base Specifications Issue 7, 2018 Edition, Copyright
(C) 2018 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.opengroup.org/unix/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 2017 WHAT(1P)
Pages that refer to this page: admin(1p), get(1p), prs(1p), sccs(1p)
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HTML rendering created 2025-09-06 by Michael Kerrisk, author of The Linux Programming Interface. For details of in-depth Linux/UNIX system programming training courses that I teach, look here. Hosting by jambit GmbH. |
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