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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.1‐2008, 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.
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.1‐2008, 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.
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.1‐2008, 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 .
IEEE/The Open Group 2013 WHAT(1P)
Pages that refer to this page: admin(1p), get(1p), prs(1p), sccs(1p)