wait 命令

wait命令：
 
    概念：阻塞当前进程的执行，直到指定的子进程结束后，当前线程才会继续执行。
 
    格式：wait [进程号]
 
    常用：wait
        在shell中直接使用wait：    等待所有的子进程结束后，当前进程才继续往下走。
        在函数中使用wait：        只等待函数中启动的后台子进程。
 
    举例：
        #!/usr/bin/env bash
 
        for file in $(ls /home/work/jxn/test);
        do
            {
              cp /home/work/jxn/test/$file /home/work/jxn/bak
            }&
        done
 
        # 等待所有的子进程都执行完成后，当前线程才继续往下执行。
        wait
 
        echo "finish"
 

 

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来源： https://www.cnblogs.com/gaoyuechen/p/16527493.html