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* doc/autoconf.texi (Limitations of Builtins): More details on

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`test -n ='.
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Akim Demaille 2000-05-23 16:59:38 +00:00
parent 7435a2e96c
commit 9272d4ee9b
2 changed files with 11 additions and 6 deletions
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@ -1,3 +1,8 @@
2000-05-23 Akim Demaille <akim@epita.fr>
* doc/autoconf.texi (Limitations of Builtins): More details on
`test -n ='.
2000-05-23 Akim Demaille <akim@epita.fr>
Simplify the interface: users shouldn't need to explicitly check

12
doc/autoconf.texi
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@ -4768,14 +4768,14 @@ start with a dash, since @code{test} might interpret its argument as an
option (e.g., @samp{@var{string} = "-n"}).
Contrary to a common belief, @samp{test -n @var{string}} and @samp{test
-z @var{string}} @strong{are} portable, nevertheless many shells (e.g.,
FIXME: AIX IIRC) have bizarre precedence and may be confused if
@var{string} looks like an operator:
-z @var{string}} @strong{are} portable, nevertheless many shells (such
as Solaris 2.5, AIX 3.2, UNICOS 10.0.0.6, Digital Unix 4 etc.) have
bizarre precedence and may be confused if @var{string} looks like an
operator:
@example
@c FIXME: Hm, IIRC:
$ test -n "="
error: missing argument
$ test -n =
test: argument expected
@end example
If there are risks, use @samp{test "x@var{string}" = x} or @samp{test