Date: Sun, 10 May 1998 20:58:08 -0400 (EDT) From: "John W. DeBoskey" <jwd@unx.sas.com> To: freebsd-hackers@FreeBSD.ORG Subject: Re: Unexpected behaviour from pdksh. Comments? Message-ID: <199805110058.AA09375@mozart>
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Hello,
I seem to be unable to send mail to brian@Awfulhak.org... I'm not
sure why.
----- The following addresses had permanent fatal errors -----
<brian@Awfulhak.org>
----- Transcript of session follows -----
... while talking to awfulhak.org.:
>>> RCPT To:<brian@Awfulhak.org>
<<< 550 <brian@Awfulhak.org>... we do not relay jwd@unx.sas.com
550 <brian@Awfulhak.org>... User unknown
Anyways...
While I understand the following coding style, it isn't a very
pretty sight when trying to convert the following:
cmdx | cmdy | while read line1; do
process line1
echo new_info | while read line2; do
process line2
done
done
While I am not condoning the above (the processing of line1 could
be a function of some sort), it is still much, much easier to read
than the converted format noted below by Brian.
So, what would it take to add execution of the last pipe element
in the current shell?
Thanks,
John
brian@Awfulhak.org (Brian Somers) says:
> The *only* shell that executes the last bit of a pipe inline is the
> original ksh. Pdksh, zsh, sh, ash, bash and probably just about all
> other shells create a subshell.
>
> This is a pain -
>
> something | read this that theother
>
> must be changed to
>
> read this that theother <<eof
> `something`
> eof
>
> It's too late to change the other shells now though.
>> Given the following sample Korn Shell script:
>>
>> export FOO=foo
>> echo $FOO
>>
>> echo bar | while read var; do
>> export FOO=$var
>> echo $FOO
>> done
>> echo $FOO
>>
>> The output is:
>> foo
>> bar
>> foo
>>
>> where I was expecting:
>> foo
>> bar
>> bar
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