Ctrl+c,Ctrl+d,Ctrl+z在Linux中意义

Ctrl+c和ctrl+z都是中断命令,但是他们的作用却不一样.

Ctrl+c是强制中断程序的执行。

Ctrl+z的是将任务中断,但是此任务并没有结束,他仍然在进程中他只是维持挂起的状态。

[root@localhost ~]# ping baidu.com

PING baidu.com (220.181.57.217) 56(84) bytes of data.

64 bytes from 220.181.57.217: icmp_seq=1 ttl=128 time=58.7 ms

64 bytes from 220.181.57.217: icmp_seq=2 ttl=128 time=76.6 ms

64 bytes from 220.181.57.217: icmp_seq=3 ttl=128 time=54.6 ms

64 bytes from 220.181.57.217: icmp_seq=4 ttl=128 time=72.7 ms

64 bytes from 220.181.57.217: icmp_seq=5 ttl=128 time=51.3 ms

64 bytes from 220.181.57.217: icmp_seq=6 ttl=128 time=124 ms

64 bytes from 220.181.57.217: icmp_seq=7 ttl=128 time=71.2 ms

64 bytes from 220.181.57.217: icmp_seq=8 ttl=128 time=52.4 ms

64 bytes from 220.181.57.217: icmp_seq=9 ttl=128 time=51.7 ms

64 bytes from 220.181.57.217: icmp_seq=10 ttl=128 time=254 ms

64 bytes from 220.181.57.217: icmp_seq=12 ttl=128 time=64.2 ms

64 bytes from 220.181.57.217: icmp_seq=13 ttl=128 time=51.8 ms

64 bytes from 220.181.57.217: icmp_seq=14 ttl=128 time=92.5 ms

64 bytes from 220.181.57.217: icmp_seq=15 ttl=128 time=52.1 ms

64 bytes from 220.181.57.217: icmp_seq=16 ttl=128 time=51.8 ms

^Z

[1]+ Stopped ping baidu.com

12345678910111213141516171819

用户可以使用fg/bg操作继续前台或后台的任务,

fg命令重新启动前台被中断的任务,

[root@localhost ~]# fg

ping baidu.com

64 bytes from 180.149.132.47: icmp_seq=6 ttl=128 time=59.0 ms

64 bytes from 180.149.132.47: icmp_seq=7 ttl=128 time=67.2 ms

64 bytes from 180.149.132.47: icmp_seq=8 ttl=128 time=54.5 ms

64 bytes from 180.149.132.47: icmp_seq=10 ttl=128 time=55.9 ms

64 bytes from 180.149.132.47: icmp_seq=12 ttl=128 time=56.8 ms

64 bytes from 180.149.132.47: icmp_seq=13 ttl=128 time=60.0 ms

64 bytes from 180.149.132.47: icmp_seq=14 ttl=128 time=155 ms

^Z

[1]+ Stopped ping baidu.com

1234567891011

bg命令把被中断的任务放在后台执行.

例如:当你vi一个文件是,如果需要用shell执行别的操作,但是你又不打算关闭vi,因为你得存盘推出,你可以简单的按下Ctrl+z,shell会将vi进程挂起~,当你结束了那个shell操作之后,你可以用fg命令继续vi你的文件。

Ctrl+d 不是发送信号，而是表示一个特殊的二进制值，表示 EOF。