linux实现自动检测进程是否存活的脚本

#!/bin/sh
while true
do
        pnmon=`ps aux | grep nmon | grep -v grep`;

        if [ "$pnmon" == "" ]; then
                sleep 1;
                echo "no nmon process";
                echo "正在启动中";
                nmon -f -s3 -c300 -m /root/qumf/;
        else
                echo "process exsits";
                break;
        fi
done