nohup命令
可以将程序以忽略挂起信号的方式运行起来,被运行程序的输出信息将不会显示到终端。
无论是否将nohup命令的输出重定向到终端,输出都将写入到当前目录的nohup.out文件中。如果当前目录的nohup.out文件不可写,则输出重定向到$HOME/nohup.out文件中。
让执行的命令在当前会话终止后继续保持运行
正常情况下,如果用户退出登录或会话终止,则用户正在执行并可持续一段时间的命令(非守护进程)将自动终止。使用nohup命令可以实现在用户退出或当前会话终止后继续保持运行,具体的例子如下:
[[email protected] ~]# nohup ping g.cn nohup: 忽略输入并把输出追加到"nohup.out" #<==当前终端已经hang住,此时强制关闭当前终端(例如关闭该标签或者Ss日客户端工具),这个ping命令依然会在后台运行。 # 但是Ctrl + C 会退出命令执行 [[email protected] ~]# ps -ef|grep ping root 1818 1 0 19:19 ? 00:00:00 ping g.cn root 1820 1797 0 19:19 pts/1 00:00:00 grep ping [[email protected] ~]# tail -f nohup.out 64 bytes from 203.208.40.79: icmp_seq=97 ttl=128 time=42.2 ms 64 bytes from 203.208.40.79: icmp_seq=98 ttl=128 time=42.7 ms 64 bytes from 203.208.40.79: icmp_seq=99 ttl=128 time=42.7 ms 64 bytes from 203.208.40.79: icmp_seq=100 ttl=128 time=42.7 ms 64 bytes from 203.208.40.79: icmp_seq=101 ttl=128 time=42.6 ms 64 bytes from 203.208.40.79: icmp_seq=102 ttl=128 time=42.4 ms 64 bytes from 203.208.40.79: icmp_seq=103 ttl=128 time=43.0 ms 64 bytes from 203.208.40.79: icmp_seq=104 ttl=128 time=50.7 ms 64 bytes from 203.208.40.79: icmp_seq=105 ttl=128 time=42.9 ms 64 bytes from 203.208.40.79: icmp_seq=106 ttl=128 time=43.0 ms
在工作中我们一般会配合&符运行nohup命令,让程序直接在后台运行:
[[email protected] ~]# nohup ping g.cn & [1] 1855 [[email protected] ~]# nohup: 忽略输入并把输出追加到"nohup.out" [[email protected] ~]# tail -f nohup.out 64 bytes from 203.208.40.95: icmp_seq=8 ttl=128 time=42.1 ms 64 bytes from 203.208.40.95: icmp_seq=9 ttl=128 time=43.3 ms 64 bytes from 203.208.40.95: icmp_seq=10 ttl=128 time=44.1 ms 64 bytes from 203.208.40.95: icmp_seq=11 ttl=128 time=42.5 ms 64 bytes from 203.208.40.95: icmp_seq=12 ttl=128 time=42.9 ms 64 bytes from 203.208.40.95: icmp_seq=13 ttl=128 time=42.6 ms 64 bytes from 203.208.40.95: icmp_seq=14 ttl=128 time=42.8 ms 64 bytes from 203.208.40.95: icmp_seq=15 ttl=128 time=42.8 ms 64 bytes from 203.208.40.95: icmp_seq=16 ttl=128 time=134 ms 64 bytes from 203.208.40.95: icmp_seq=17 ttl=128 time=42.8 ms 64 bytes from 203.208.40.95: icmp_seq=18 ttl=128 time=42.2 ms 64 bytes from 203.208.40.95: icmp_seq=19 ttl=128 time=43.2 ms 64 bytes from 203.208.40.95: icmp_seq=20 ttl=128 time=43.7 ms 64 bytes from 203.208.40.95: icmp_seq=21 ttl=128 time=42.0 ms
类似功能的命令还有screen和直接使用&符。
原文地址:https://www.cnblogs.com/fadewalk/p/10846978.html
时间: 2024-10-13 12:08:58