9.10 nohup：用户退出系统进程继续工作

[root@cs6 ~]# 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
 
[root@cs6 ~]# 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
 
[root@cs6 ~]# 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

[root@cs6 ~]# nohup ping g.cn &
[1] 1855
[root@cs6 ~]# nohup: 忽略输入并把输出追加到"nohup.out"
 
[root@cs6 ~]# 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