Ctrl+c,Ctrl+d,Ctrl+z在Linux中意義
Ctrl+c和ctrl+z都是中斷命令,但是他們的作用卻不一樣.
Ctrl+c是強(qiáng)制中斷程序的執(zhí)行。
Ctrl+z的是將任務(wù)中斷,但是此任務(wù)并沒有結(jié)束,他仍然在進(jìn)程中他只是維持掛起的狀態(tài)。
[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
用戶可以使用fg/bg操作繼續(xù)前臺(tái)或后臺(tái)的任務(wù),
fg命令重新啟動(dòng)前臺(tái)被中斷的任務(wù),
[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
bg命令把被中斷的任務(wù)放在后臺(tái)執(zhí)行.
例如:當(dāng)你vi一個(gè)文件是,如果需要用shell執(zhí)行別的操作,但是你又不打算關(guān)閉vi,因?yàn)槟愕么姹P推出,你可以簡單的按下Ctrl+z,shell會(huì)將vi進(jìn)程掛起~,當(dāng)你結(jié)束了那個(gè)shell操作之后,你可以用fg命令繼續(xù)vi你的文件。
Ctrl+d 不是發(fā)送信號(hào)，而是表示一個(gè)特殊的二進(jìn)制值，表示 EOF。
以上就是本文的全部內(nèi)容，希望對(duì)大家的學(xué)習(xí)有所幫助，也希望大家多多支持腳本之家。
