The below check is not working:

```
if [ $LEN = `expr $CNPROC + $CTotal` ])

```

and returns `expr non-numeric argument shell script`.

Always it is going to else. Please tell me what is the mistake.

Earlier I was not using while so the same thing was working fine now suddenly when I did put it in the while loop it is no working.

```
#!/usr/bin/ksh 
echo "`${BOLD}`    ***** Checking Memory Utilization User*****`${UNBOLD}`"
echo "==================================================="

IFS='|'
cat configMachineDetails.txt | grep -v "^#" | while read MachineType UserName MachineName
do
    export MEMORY_USAGE1=`ssh -f -T ${UserName}@${MachineName} prstat -t -s rss 1 2 | tr '%' ' '| awk '$5>5.0'`
    export LEN=`echo "$MEMORY_USAGE1"|wc -l`
    export CNPROC=`echo "$MEMORY_USAGE1"|grep "NPROC"|wc -l`
    export CTotal=`echo "$MEMORY_USAGE1"|grep "Total"|wc -l`

    if [ $LEN = `expr $CNPROC + $CTotal` ]
    then
        echo "`${BOLD}`**************All usages are normal !!!!!! *************`${UNBOLD}`"
    else
        echo "`${BOLD}`**** Memory(%) is more than 5% in MachineType $MachineType  UserName $UserName
 MachineName  $MachineName   *******`${UNBOLD}`"
        echo "===================================================="
        echo "$MEMORY_USAGE1"
    fi
done

```