* Interesting tidbit from the austin-group list
@ 2003-04-01 2:42 Bart Schaefer
2003-04-01 3:22 ` Dan Nelson
0 siblings, 1 reply; 3+ messages in thread
From: Bart Schaefer @ 2003-04-01 2:42 UTC (permalink / raw)
To: zsh-workers
Jason Zions wrote:
------------------------------------------------------------------------
Since (( is not permitted to be a reserved word, a conforming shell
*cannot* treat it as such. Among other things, if there is an executable
file named (( anywhere in $PATH, then
while (( $count < $NUMLOOPS ))
is required to invoke that executable program rather than any
functionality built into the shell.
------------------------------------------------------------------------
^ permalink raw reply [flat|nested] 3+ messages in thread
* Re: Interesting tidbit from the austin-group list
2003-04-01 2:42 Interesting tidbit from the austin-group list Bart Schaefer
@ 2003-04-01 3:22 ` Dan Nelson
2003-04-01 5:35 ` Bart Schaefer
0 siblings, 1 reply; 3+ messages in thread
From: Dan Nelson @ 2003-04-01 3:22 UTC (permalink / raw)
To: Bart Schaefer; +Cc: zsh-workers
In the last episode (Apr 01), Bart Schaefer said:
> Jason Zions wrote:
> ------------------------------------------------------------------------
> Since (( is not permitted to be a reserved word, a conforming shell
> *cannot* treat it as such. Among other things, if there is an executable
> file named (( anywhere in $PATH, then
>
> while (( $count < $NUMLOOPS ))
>
> is required to invoke that executable program rather than any
> functionality built into the shell.
> ------------------------------------------------------------------------
I don't think (( is even a word. It's two nested subshells. A
conforming shell should run the command $count, with stdin redirected
from $NUMLOOPS, inside a subshell inside a subshell. ash behaves this
way:
$ while (( 1 < 2 )) ; do echo hi ; sleep 1; done
1: not found
$ while (( true < 2 )) ; do echo hi ; sleep 1; done
cannot open 2: No such file or directory
[[ is a different story, though. Forcing that to be interpreted as a
command has a precedent: "[" aka test.
--
Dan Nelson
dnelson@allantgroup.com
^ permalink raw reply [flat|nested] 3+ messages in thread
* Re: Interesting tidbit from the austin-group list
2003-04-01 3:22 ` Dan Nelson
@ 2003-04-01 5:35 ` Bart Schaefer
0 siblings, 0 replies; 3+ messages in thread
From: Bart Schaefer @ 2003-04-01 5:35 UTC (permalink / raw)
To: zsh-workers
On Mar 31, 9:22pm, Dan Nelson wrote:
}
} I don't think (( is even a word. It's two nested subshells.
You're correct, as I should have realized and as was pointed out on the
austin-group list a couple of hours after I forwarded the previous snippet.
^ permalink raw reply [flat|nested] 3+ messages in thread
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2003-04-01 2:42 Interesting tidbit from the austin-group list Bart Schaefer
2003-04-01 3:22 ` Dan Nelson
2003-04-01 5:35 ` Bart Schaefer
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