if  test $? -eq 0
then
else
fi

##</code><code>##

if [  $? -eq 0 ]
then
else
fi

##</code><code>##

cd go_to_dir_where_perl_program_exists  &&
if   /usr/bin/perl perlscript.pl
   then echo "success"
   # do some more stuff
else
  echo "failure"
  # do some more stuff
fi