[GLLUG] Shell scripting weirdness

Robert McKay robert at mckay.com
Wed May 22 22:30:16 UTC 2013

Greetings fellow Lugites,

I was wondering if anyone knows why these two commands behave 

bash -c "cat & wait"
bash -c "cat <&0 & wait"

The first just exits right away. The second one does what I 
wanted/expected the first one to do.

also when running the same bash shell in sh-compat mode;

sh -c "cat <&0 & wait"

it behaves like the first one and on a ksh shell "(cat & wait)" by 
itself worked.. unfortunately I don't have the exact version of ksh 
handy and my attempts to repeat that one here have failed.

The problem I was actually trying to solve has already been dealt with 
and this is a simplified demonstration of what I was actually doing - 
it's just been annoying me all afternoon as I couldn't see why they 
should behave differently.. other than just 'because' :p


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