learning shell monitor prog function

#!/bin/bash

while [ 1 ]
do
# get under /appServer/app directory prog numbers
nprogs=`ls -t /appServer/app | cut -d" " -f1 | wc -l`
#echo  $nprogs

if [ $nprogs -eq 0 ]
then
        echo  "not progs"    > /dev/null
else
        #echo  "judge driver running status"
        for i in `seq 1 $nprogs`
        do
                #echo $i
                prog=`ls -t /appServer/app | cut -d" " -f1 | head -n"$i" | tail -n1`
                #echo $prog
                ps -ef | grep "$prog" | grep -q -v grep
                if [ $? -ne 0 ];then                      
                        #/appServer/app/$prog > /dev/null &
                        /appServer/app/$prog &
                fi 
        done
fi

sleep 60

done