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.\"
.\" cook - file construction tool
.\" Copyright (C) 1990, 1991, 1992, 1993, 1994, 1997 Peter Miller;
.\" All rights reserved.
.\"
.\" This program is free software; you can redistribute it and/or modify
.\" it under the terms of the GNU General Public License as published by
.\" the Free Software Foundation; either version 2 of the License, or
.\" (at your option) any later version.
.\"
.\" This program is distributed in the hope that it will be useful,
.\" but WITHOUT ANY WARRANTY; without even the implied warranty of
.\" MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
.\" GNU General Public License for more details.
.\"
.\" You should have received a copy of the GNU General Public License
.\" along with this program; if not, write to the Free Software
.\" Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111, USA.
.\"
.\" MANIFEST: User Guide, Built-In Functions, Not
.\"
.H 2 "not"
This function requires zero or more arguments,
the value to be logically negated.
It returns "1" (true) if all of the arguments are "" (false),
or there are no arguments;
and returns "" (false) otherwise.
This is symmetric with the definition of true and false for
.BR if .
.H 3 "Example"
This is often seen in recipes:
.eB
%1/%0%2.o: %1/%0%2.c
single-thread %2.o
{
if [not [exists [dirname [target]]]] then
mkdir -p [dirname [target]]
set clearstat;
[cc] [cc_flags] -I%1 %1/%0%2.;
mv %2.o [target];
}
.eE
Note that "\f(CW%0\fP" matches zero or more whole filename portions,
including the trailing slash.
See the chapter on pattern matching for more information.
.P
This is an example only.
The ``mkdir'' recipe flag creates the directory more efficiently.
.H 3 "See Also"
and, or
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