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#!/usr/bin/perl
#by Zaxo of perlmonks
...
#If the apps don't run as daemons, you may need to have 
#them ignore SIGHUP or else call &POSIX::setsid so that 
#the parent's exit doesn't trigger an early demise of the kids.

#!/usr/bin/perl

...

# Evaluating $! will give you the reason you couldn't 
# spawn the exec'ed process.