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What shell you're using? ksh93 and zsh support coprocesses.

This is with dtksh (/usr/dt/bin/dtksh)on Solaris:

$ unset v
$ sqlplus -s / as sysdba<<-! |&
set feed off pages 0
exec...

Or we can use the basic shell "jobs" command. Obviously we would need to build a counter into the loop to allow us to stop after a given amount of time.


while [ "`jobs`" ]
do
echo...