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* doc/autoconf.texi (Parentheses): Mention problem with (( in

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shells.
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Paul Eggert 2007-02-08 23:42:46 +00:00
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@ -1,3 +1,8 @@
2007-02-08 Paul Eggert <eggert@cs.ucla.edu>
* doc/autoconf.texi (Parentheses): Mention problem with (( in
shells.
2007-02-07 Ralf Wildenhues <Ralf.Wildenhues@gmx.de> 2007-02-07 Ralf Wildenhues <Ralf.Wildenhues@gmx.de>
and Paul Eggert <eggert@cs.ucla.edu> and Paul Eggert <eggert@cs.ucla.edu>

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doc/autoconf.texi
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@ -11896,9 +11896,13 @@ for the rationale.
@section Parentheses in Shell Scripts @section Parentheses in Shell Scripts
@cindex Shell parentheses @cindex Shell parentheses
Beware of two opening parentheses in a row, as some shell Beware of two opening parentheses in a row, as many shell
implementations mishandle them. For example, @samp{pdksh} 5.2.14 implementations treat them specially. Posix requires that the command
misparses the following code: @samp{((cat))} must behave like @samp{(cat)}, but many shells, including
Bash and the Korn shell, treat @samp{((cat))} as an arithmetic
expression equivalent to @samp{let "cat"}, and may or may not report an
error when they detect that @samp{cat} is not a number. As another
example, @samp{pdksh} 5.2.14 misparses the following code:
@example @example
if ((true) || false); then if ((true) || false); then