linux shell 控制脚本执行次数

下面是俺写的测试脚本，为了能运行多次测试程序性能，想控制运行个数，通过lockfile 和 grep配合进行限制。
#!/bin/bash
. /etc/profile
project=simnin
export CLASSPATH=.:/usr/$project:$CLASSPATH
for jarfile in /usr/$project/lib/*.jar ; do
if ! echo $CLASSPATH | grep $jarfile > /dev/null
then
  export CLASSPATH=$CLASSPATH:$jarfile
fi
done
#echo $#
#echo $*
#echo $0 $1 $2 $3
#run once when lock file
lckfile="/tmp/.perfomanceTest.lck"
lockfile -1 -r 60 $lckfile
log=/tmp/perftest.log
echo >> $log
lmt=1
if [ "`date +%H`" -lt 8 -o "`date +%H`" -gt 18 ]; then
  lmt=10
fi
prog="com.lj.PerformanceTest"
ps -ef | grep $prog | grep "grep $prog" -v >>$log
cnt=`ps -ef | grep $prog | grep "grep $prog" -v -c `
if [ "$cnt" -gt "$lmt" ]; then
  rm -f $lckfile
  echo "exit 1 when $cnt > $lmt ." >>$log
  exit 1;
fi
echo "$$ start at `date`" >>$log
#echo =====================ENV============== >>$log
#env >>$log
echo =====================CMD============== >>$log
echo $0 $* >> $log
$JAVA_HOME/bin/java com.lj.PerformanceTest $* >>$log 2>&1  &
rm -f $lckfile
echo "$$ $! is running" >>$log
echo "$$ end at `date`" >>$log