The difference and usage of Ctrl+z, Ctrl+c and Ctrl+d in Linux commands

What does Ctrl+c, Ctrl+d, Ctrl+z mean in Linux?

Ctrl+c and ctrl+z are both interrupt commands, but their functions are different.

Ctrl+c is used to force the execution of the program to be interrupted.

Ctrl+z interrupts the task, but the task is not finished. It is still in progress and just remains in a suspended state.

[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

Users can use fg/bg operations to continue the foreground or background tasks.

The fg command restarts the task that was interrupted in the foreground.

[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

The bg command puts the interrupted task into the background for execution.

For example: when you vi a file, if you need to use the shell to perform other operations, but you do not intend to close vi because you have to save and exit, you can simply press Ctrl+z, the shell will suspend the vi process~, when you end the shell operation, you can use the fg command to continue vi your file.

Ctrl+d does not send a signal, but represents a special binary value, indicating EOF.

The above is the full content of this article. I hope it will be helpful for everyone’s study. I also hope that everyone will support 123WORDPRESS.COM.

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