shell脚本再执行过程中就一个进程，从头到尾
下面配置shell脚本执行过程中启动多个进程同时执行
#!/bin/bashfor ((i=1;i<=10;i++))do( echo "$i" sleep 10) &donewaitecho -E "########## $SECONDS ##########"
注：
$SECONDS：是执行完脚本所用的时间
wait：是等待所有的进程执行完毕
执行结果
[root@wcy ~]# bash test.sh 12345678910########## 10 ##########
进程查看
[root@wcy ~]# ps -ef | grep test.sh root 1764 1565 0 19:23 pts/1 00:00:00 bash test.shroot 1765 1764 0 19:23 pts/1 00:00:00 bash test.shroot 1766 1764 0 19:23 pts/1 00:00:00 bash test.shroot 1767 1764 0 19:23 pts/1 00:00:00 bash test.shroot 1770 1764 0 19:23 pts/1 00:00:00 bash test.shroot 1772 1764 0 19:23 pts/1 00:00:00 bash test.shroot 1773 1764 0 19:23 pts/1 00:00:00 bash test.shroot 1774 1764 0 19:23 pts/1 00:00:00 bash test.shroot 1776 1764 0 19:23 pts/1 00:00:00 bash test.shroot 1777 1764 0 19:23 pts/1 00:00:00 bash test.shroot 1778 1764 0 19:23 pts/1 00:00:00 bash test.shroot 1786 1708 0 19:23 pts/2 00:00:00 grep test.sh
[root@wcy ~]# ps -ef | grep test.sh | grep -v grep | wc -l11
查看同一时刻多少个sleep在跑
[root@wcy ~]# ps -ef | grep sleep | grep -v grep root 2168 2165 0 21:59 pts/1 00:00:00 sleep 10root 2169 2166 0 21:59 pts/1 00:00:00 sleep 10root 2172 2167 0 21:59 pts/1 00:00:00 sleep 10root 2174 2171 0 21:59 pts/1 00:00:00 sleep 10root 2175 2173 0 21:59 pts/1 00:00:00 sleep 10root 2176 2170 0 21:59 pts/1 00:00:00 sleep 10root 2179 2177 0 21:59 pts/1 00:00:00 sleep 10root 2181 2178 0 21:59 pts/1 00:00:00 sleep 10root 2182 2180 0 21:59 pts/1 00:00:00 sleep 10root 2184 2183 0 21:59 pts/1 00:00:00 sleep 10
[root@wcy ~]# ps -ef | grep sleep | grep -v grep | wc -l10
多进程的shell脚本可以用于并行执行多任务
#!/bin/bashfor ((i=1;i<=1;i++))do(for ((num=1;num<=100;num++))do echo "task1-- $num" sleep 1done) &(for ((ber=1;ber<=100;ber++))do echo "task2-- $ber" sleep 1done) &donewait
效果，两个同时执行
[root@wcy ~]# bash duo.sh task2-- 1task1-- 1task2-- 2task1-- 2task2-- 3task1-- 3task2-- 4task1-- 4········
脚本进程
[root@wcy ~]# ps -ef | grep duo.sh | grep -v grep root 2221 1491 0 22:13 pts/0 00:00:00 bash duo.shroot 2222 2221 0 22:13 pts/0 00:00:00 bash duo.shroot 2223 2221 0 22:13 pts/0 00:00:00 bash duo.sh
同时执行的进程
[root@wcy ~]# ps -ef | grep sleep | grep -v grep root 2357 2223 0 22:14 pts/0 00:00:00 sleep 1root 2358 2222 0 22:14 pts/0 00:00:00 sleep 1