Hi - I'm finding some unexpected operation when testing in a ksh script.
EG
TST=`grep donut file1`
FSZ=`ls -l file1 | awk '{ print $5 }'`
if [ -n $TST ] ; then
if [ $FSZ > 200 ] ;then
echo "Greater than 200"
else
echo "Less than 200"
fi
elif [ -z $TST ] ;then
echo "ZERO"
fi

If FILE1 does NOT contain the string 'donut' I would expect the -z to be
invoked but it doesn't because the first test just fails - how do I avoid this ??

thanks

grep donut file1
TST=`echo $?`
FSZ=`ls -l file1 | awk '{ print $5 }'`
if [  $TST -eq 0 ] ; then
  if [ $FSZ > 200 ] ;then
    echo "Greater than 200"
  else
    echo "Less than 200"
  fi
else 
  echo "ZERO"
fi

Use double square brackets, i.e. if [[ -n $TST ]]