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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, Defined
.\"
.H 2 "defined"
This function requires a single argument,
the name of a variable to be tested for existence.
It returns "1" (true) if the named variable is defined and "" (false) if it
is not.
.H 3 "Example"
This function is most often seen in conditional portions of cookbooks:
.eB
if [defined baseline] then
cc_flags = [cc_flags] -I[baseline];
.eE
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