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WHAT(1) General Commands Manual WHAT(1)

what
show what versions of object modules were used to construct a file

what [
-s
] file ...

what reads each file and searches for sequences of either the form ‘$’ immediately followed by the system name (sysname) as defined by uname(3), or the form “@(#)” as inserted by the source code control system (SCCS).
When ‘$’ followed by the system name is encountered what prints the remainder of the string up to a ‘$’ or any non-printable character.
When “@(#)” is encountered what prints the remainder of the string, up to a NUL, newline, double quote, backslash, or ‘>’ character.
If the -s option is specified, only the first occurrence of an identification string in each file is printed.

The what utility exits with a return value of 0 if any identification strings were found, or with a return value of 1 otherwise.

The what utility is compliant with the X/Open System Interfaces option of the IEEE Std 1003.1-2008 (“POSIX.1”) specification.
Processing $sysname$ sequences is an OpenBSD extension.

The what command appeared in 4.0BSD.

As BSD is not licensed to distribute SCCS, this is a rewrite of the what command which is part of SCCS. As such it may not behave exactly the same as that command does.
January 22, 2015 OpenBSD-current