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what - Displays identifying information for Source Code Control System
what [-s] file...
Interfaces documented on this reference page conform to industry standards
Refer to the standards(5) reference page for more information about
industry standards and associated tags.
-s Searches for just the first occurrence of @(#).
Pathname of the file to search.
The what command searches the named files for all occurrences of the
pattern that get(1) substitutes for the %Z% keyletter, and writes to
standard output whatever follows the pattern up to, but not including, the
first " (double quote), > (redirection symbol), newline character, \
(backslash), or null character.
By convention, the value substituted by get(1) for the %Z% keyletter is
@(#). (See the get(1) command or the prs(1) command for a description of
If you specify more than one file, each line of output is preceded by the
name of the file it is read from; otherwise, the file name is not
displayed. If no file is specified, what reads from standard input.
The what command is intended for use in conjunction with the get command,
which automatically inserts the identifying information. You can also use
the what command on files where the information is inserted manually.
The following exit values are returned:
0 Matches were found.
1 No matches were found.
Suppose that the file test.c contains a C program that includes either of
the following lines:
char ident[ ] = "@(#)Test Program";
#pragma ident "@(#)Test Program"
If you compile test.c to produce test.o and a.out, you could then enter the
what test.c test.o a.out
This command would produce the following displays:
The following environment variables affect the execution of what:
Provides a default value for the internationalization variables that
are unset or null. If LANG is unset or null, the corresponding value
from the default locale is used. If any of the internationalization
variables contain an invalid setting, the utility behaves as if none of
the variables had been defined.
If set to a non-empty string value, overrides the values of all the
other internationalization variables.
Determines the locale for the interpretation of sequences of bytes of
text data as characters (for example, single-byte as opposed to
multibyte characters in arguments and input files).
Determines the locale for the format and contents of diagnostic
messages written to standard error.
Determines the location of message catalogues for the processing of
Commands: admin(1), cdc(1), comb(1), delta(1), get(1), prs(1), rmdel(1),
sact(1), sccs(1), sccsdiff(1), sccshelp(1), unget(1), val(1)
Programming Support Tools
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