NAME
what —
show what versions of object modules
were used to construct a file
SYNOPSIS
what |
[-s] file ... |
DESCRIPTION
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.
EXIT STATUS
The what utility exits with a return value
of 0 if any identification strings were found, or with a return value of 1
otherwise.
STANDARDS
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.
HISTORY
The what command first appeared in the
SCCS package and was rewritten for 4.0BSD for
licensing reasons.