Date: Tue, 9 Jul 1996 11:16:50 -0400 From: Chet Ramey <chet@odin.INS.CWRU.Edu> To: koshy@india.hp.com Cc: hackers@freebsd.org Subject: Re: SH bugs? Message-ID: <9607091516.AA04351.SM@odin.INS.CWRU.Edu> In-Reply-To: Message from koshy@india.hp.com of Tue, 09 Jul 1996 09:11:55 %2B0530 (id <199607090341.AA093623716@fakir.india.hp.com>)
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> Bug 1:
> ~~~~~
>
> SH does not expand wildcarded terms properly
>
> $ cd /tmp
> $ touch bletch
> $ ls bletch
> bletch
> $ cat < /tmp/bl*
> cannot open /tmp/bl*: no such file
POSIX.2 says an interactive shell is permitted to not do pathname
expansion on the filename in a redirection specification.
Non-interactive shells may not do it at all; interactive shells may do
it only if the expansion results in a single word.
The FreeBSD sh conforms to POSIX in this respect.
> Bug 2:
> ~~~~~~
>
> CTRL-Z when executing a `for' loop works wierdly
>
> $ cd /tmp/
> $ for i in /usr/share/doc/handbook/*.html; do
> echo $i
> ln -s $i .
> done
> <hit ctrl-Z a few times>
> $ jobs -l
> [1] 1023 Stopped ln -s ${i} .
> [2] 1077 Stopped ln -s ${i} .
> [3] 1115 Stopped ln -s ${i} .
> [4] 1128 Stopped ln -s ${i} .
> [5] 1139 Stopped ln -s ${i} .
>
> These `jobs' need to be restarted explicitly : $ kill -CONT 1023 1077 ....
> or $ fg %1 ...
It's not all that weird. Job control works only on processes started
as children of the shell. It cannot be used to suspend an entire for
loop. If you want to suspend the loop as a whole, put the command in
parentheses to force it into a subshell.
> Bug 3:
> ~~~~~~
>
> `kill' doesn't accept the %<job-number> syntax
>
> $ kill %1
> kill: illegal process id: %1
I don't think `kill' is a shell builtin on FreeBSD. Since it's an
external command, it cannot know about job control identifiers. It
should be possible to write a shell function to add the desired
behavior to kill using the `jobid' builtin; I believe a sample is
distributed with the FreeBSD sh source.
--
``The lyf so short, the craft so long to lerne.'' - Chaucer
Chet Ramey, Case Western Reserve University Internet: chet@po.CWRU.Edu
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