关于shell脚本中grep返回异常信息

关于shell脚本中grep返回错误信息

  top -n 3 |grep java|grep irm |awk '{print $1,$9}' >restorecpufile

        jvmpid=`awk 'NR==1{print}' restorecpufile | awk '{print $1}'`

        jvmcpu=`awk 'NR==1{print}' restorecpufile | awk '{print $2}'`

        if [ ${jvmcpu:-999} != "999"  ] && [ `echo  "${jvmcpu} >= ${LIMIT}" |bc`  -eq  1  ];then

                

                echo "ooooooooo$jvmpid"

                if [ ${jvmpid:-999} != "999" ];then

                        echo '$jvmpid' = $jvmpid

                        #ps -ef >~/jvmcpu/1111111

                        #       cat ~/jvmcpu/1111111 |fgrep $jvmpid >2222222

                        ps -ef|grep $jvmpid > jvmcpulog.out              #执行这句，会报错，提示grep:  不匹配的 [ 或 [^

                #       kill -3 $jvmpid

                        if ((count++ == 10));then

                                        filename=`date +%s`

                        #       tar -zcf ${filename}.tar  ~/jvmcpu/jvmcpulog.out

                                        echo "xiaoxi"

                                        count=0

                                echo " ">~/jvmcpu/jvmcpulog.out

                        fi


                

                fi 

        #else 

        #       echo "OG "

        

        fi

如题， 这个原因是为什么。应该怎么解决
------解决方案--------------------
报什么错误
是不是$jvmpid 的值是空的。
------解决方案--------------------
建议减少管道的使用，比如：

top -n 3 
------解决方案--------------------
 awk '/java.*irm/{print $1,$9}' >restorecpufile

jvmpid=`awk 'NR==1{print $1}' restorecpufile`

jvmcpu=`awk 'NR==1{print $2}' restorecpufile`