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* doc/autoconf.texi (Limitations of Builtins): Comment `true'.

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Akim Demaille 2000-11-14 14:22:13 +00:00
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@ -1,3 +1,7 @@
2000-11-14 Akim Demaille <akim@epita.fr>
* doc/autoconf.texi (Limitations of Builtins): Comment `true'.
2000-11-14 Akim Demaille <akim@epita.fr>
* BUGS: New file.

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doc/autoconf.texi
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@ -5701,6 +5701,22 @@ $ exit
@noindent
Fortunately this bug affects only trap.
@item @command{true}
@cindex @command{true}
@cindex @command{:}
Don't worry: as far as we know @command{true} is portable.
Nevertheless, it's not always a builtin (e.g., Bash 1.x), and the
portable shell community tends to prefer using @command{:}. This has an
funny side effect: when asked whether @command{false} is more portable
than @command{true} Alexandre Oliva answered
@quotation
In a sense, yes, because if it doesn't exist, the shell will produce an
exit status of failure, which is correct for @command{false}, but not
for @command{true}.
@end quotation
@item @command{unset}
@cindex @command{unset}
You cannot assume the support of @command{unset}, nevertheless, because