Shell編程實現Kill線程__編程

[root@centos65 liumengyang]# cat test.sh#!/bin/sh#if the process exists,kill itpid=$(ps -ef|grep java|awk '{print $2}')pidname=$(ps -ef|grep java|grep -v 'grep'|awk '{print $1}')#judge if the process is running.if not,restart.if [ $pidname ]thenecho "the process is running.."elseecho "the process is not existing.."fi[root@centos65 liumengyang]# 

(1)grep -v 'grep'命令的作用是把grep進程顧慮掉

(2)把命令輸出值賦值給變數pid       pid=$(ps -ef|grep java|awk '{print $2}')

(3)awk  '{print $1} 命令是把一行文字按照空格分成一個數組的形式，然後通過'$1'取值。

比如"liu meng yang" 通過awk分詞以後，‘$1’對應"liu"，'$2'對應"meng"，'$3'對應"yang"