[ILUG] shell pipeline error

[Stephen Shirley]

> Great stuff!
> There was a nice tread on this already started by yourself:
> http://www.linux.ie/pipermail/ilug/2000-October/024065.html thanks,
> Padraig.

Hmm - out of curiosity I went back and re-read this thread. In the initial
message Kenn says:

"   cd /build/dir
   ( make $* ; status=$?) | tee make.log
   exit $status

but, of course, the changes to 'status' are local to the () (or {})
construct."

but that's not correct:

diamond at inlinux:~(0)> rpm -q bash
bash-1.14.7-16
diamond at inlinux:~(0)> cat er.sh
#!/bin/bash

( status=4 )
echo status=$status
unset status
{ status=4 }
echo status=$status
unset status
( export status=4 )
echo status=$status
unset status
{ export status=4 }
echo status=$status
unset status
diamond at inlinux:~(0)> ./er.sh
status=
status=4
status=
status=4
diamond at inlinux:~(0)>

That quite clearly shows that vars set inside {}'s are not local. Indeed
after a quick look at the bash man page:

"{ list; }
              list is simply executed in the current shell environment."

Anyway - that's all I have to say.

Steve
-- 
"My mom had Windows at work and it hurt her eyes real bad"