The Open Group Base Specifications Issue 7
IEEE Std 1003.1, 2013 Edition
Copyright © 2001-2013 The IEEE and The Open Group

#### NAME

> what - identify SCCS files (DEVELOPMENT)

#### SYNOPSIS

> ``[XSI] 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 XBD 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 XBD 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

> XBD Environment Variables, Utility Syntax Guidelines

#### CHANGE HISTORY

> First released in Issue 2.

End of informative text.

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