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Add example of how to use the ?: modifier properly.

This commit is contained in:
dsl 2009-10-01 21:40:31 +00:00
parent 5526bb0709
commit b7ab3bd781
1 changed files with 7 additions and 4 deletions
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11
usr.bin/make/make.1
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@ -1,4 +1,4 @@
.\" $NetBSD: make.1,v 1.161 2009/09/08 17:29:20 sjg Exp $
.\" $NetBSD: make.1,v 1.162 2009/10/01 21:40:31 dsl Exp $
.\"
.\" Copyright (c) 1990, 1993
.\" The Regents of the University of California. All rights reserved.
@ -29,7 +29,7 @@
.\"
.\" from: @(#)make.1 8.4 (Berkeley) 3/19/94
.\"
.Dd September 7, 2009
.Dd October 1, 2009
.Dt MAKE 1
.Os
.Sh NAME
@ -1061,8 +1061,11 @@ otherwise return the
Since the variable name is used as the expression, \&:\&? must be the
first modifier after the variable name itself - which will, of course,
usually contain variable expansions.
If the expression is a single token, it will likely be treated as a check
for the name being defined.
A common error is trying to use expressions like
.Dl ${NUMBERS:M42:?match:no}
which actually tests defined(NUMBERS),
to determine is any words match "42" you need to use something like:
.Dl ${${NUMBERS:M42} != "":?match:no} .
.It Ar :old_string=new_string
This is the
.At V