I learnt this one the hard way!

Do not harcode environment variables as the location of commands (e.g., Grid commands) could change. DO NOT do something like:

#!/bin/ksh
#$ -N Test_qstat
#$ -cwd

SGETOOLS=/home/sgeadmin/n1ge60/bin/sol-x86
export SGETOOLS

echo "Starting Test program..."
$SGETOOLS/qstat
echo "End Test program..."

Instead use:

#!/bin/ksh
#$ -N Test_qstat
#$ -cwd

# Set the environment variables
if [ -f $HOME/.profile ]; then
   . $HOME/.profile
fi

echo "Starting Test program..."
echo `which qstat`
qstat
echo "End Test program..."