Hi,
we've found that in ksh script last process is sometimes executed in
background, not foreground. The odd is we were able to reproduce it
only with 'su' command so far. Also this happens only with ksh
2010-06-21 and newer. ksh 2010-05-27 works fine.
Reproducer just executes what it gets as argument (some pipe operation
is required to trigger the issue), in this case the 'su' command which
runs 'sleep 1'. In some cases, it's run in background, so it finishes
immediately and does not wait for sleep.
wrapper.sh:
#!/bin/ksh
#some pipe&subshell operation is required
export DT=`date | grep -v foo | sed 's/ /_/g'`
exec $*
sleep.sh
#!/bin/sh
echo sleeping
sleep 1
on command line:
I=0;while true; do echo $I; START=$SECONDS; ./wrapper.sh su root -c
"./sleep.sh" ; ((I+=1)); ; [ $((SECONDS-START)) != 0 ] || break; done
It usually reproduces problem within 100 iterations.
Michal
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