nohup 使用
2020/7/29 10:11:07
arguments n. 争论; 争吵; 争辩; 辩论; 论据; 理由; 论点;
语法
nohup command arguments
或者
nohup options
nohup --help 查看帮助
nohup --version 查看版本
使用nohup
nohup commnd 当程序运行起来，其log会被输出记录在nohup.out文件中，这个文件会被存储在家目录或者当前目录
nohup --version
[root@samba nohup]# nohup --version
nohup (GNU coreutils) 8.22
Copyright (C) 2013 Free Software Foundation, Inc.
License GPLv3+: GNU GPL version 3 or later <http://gnu.org/licenses/gpl.html>.
This is free software: you are free to change and redistribute it.
There is NO WARRANTY, to the extent permitted by law.
Written by Jim Meyering.
[root@samba nohup]# nohup ping -c 10 172.20.90.114
nohup: ignoring input and appending output to ‘nohup.out’
[root@samba nohup]# cat nohup.out
PING 172.20.90.114 (172.20.90.114) 56(84) bytes of data.
64 bytes from 172.20.90.114: icmp_seq=1 ttl=126 time=0.194 ms
64 bytes from 172.20.90.114: icmp_seq=2 ttl=126 time=0.220 ms
64 bytes from 172.20.90.114: icmp_seq=3 ttl=126 time=0.225 ms
64 bytes from 172.20.90.114: icmp_seq=4 ttl=126 time=0.219 ms
64 bytes from 172.20.90.114: icmp_seq=5 ttl=126 time=0.225 ms
64 bytes from 172.20.90.114: icmp_seq=6 ttl=126 time=0.221 ms
64 bytes from 172.20.90.114: icmp_seq=7 ttl=126 time=0.221 ms
64 bytes from 172.20.90.114: icmp_seq=8 ttl=126 time=0.238 ms
64 bytes from 172.20.90.114: icmp_seq=9 ttl=126 time=0.220 ms
64 bytes from 172.20.90.114: icmp_seq=10 ttl=126 time=0.224 ms
--- 172.20.90.114 ping statistics ---
10 packets transmitted, 10 received, 0% packet loss, time 9000ms
rtt min/avg/max/mdev = 0.194/0.220/0.238/0.020 ms
重定向程序输出
[root@samba nohup]# nohup ping -c 10 172.20.90.114 >./result1525.txt
nohup: ignoring input and redirecting stderr to stdout
[root@samba nohup]# ls
nohup.out result1525.txt
[root@samba nohup]# cat result1525.txt
PING 172.20.90.114 (172.20.90.114) 56(84) bytes of data.
64 bytes from 172.20.90.114: icmp_seq=1 ttl=126 time=0.178 ms
64 bytes from 172.20.90.114: icmp_seq=2 ttl=126 time=0.232 ms
64 bytes from 172.20.90.114: icmp_seq=3 ttl=126 time=0.228 ms
64 bytes from 172.20.90.114: icmp_seq=4 ttl=126 time=0.228 ms
64 bytes from 172.20.90.114: icmp_seq=5 ttl=126 time=0.220 ms
64 bytes from 172.20.90.114: icmp_seq=6 ttl=126 time=0.219 ms
64 bytes from 172.20.90.114: icmp_seq=7 ttl=126 time=0.226 ms
64 bytes from 172.20.90.114: icmp_seq=8 ttl=126 time=0.228 ms
64 bytes from 172.20.90.114: icmp_seq=9 ttl=126 time=0.224 ms
64 bytes from 172.20.90.114: icmp_seq=10 ttl=126 time=0.225 ms
--- 172.20.90.114 ping statistics ---
10 packets transmitted, 10 received, 0% packet loss, time 8999ms
rtt min/avg/max/mdev = 0.178/0.220/0.232/0.023 ms
让程序在后台运行
& 表示让程序在后台运行
nohup ping -c 100 172.20.90.114 > ./result1529.txt &
让程序跟几个命令一起执行
nohup ping -c 10 172.20.59.163 > ./result1534.txt && touch a.txt &
去除提示 2>&1
默认情况下会有一个提示 nohup: ignoring input and redirecting stderr to stdout
可以使用2>&1 去除
[root@samba nohup]# nohup ping -c 9 172.20.3.1 > ./result3-1.txt 2>&1 &
[1] 4903
前提是命令要有输出文件 此处指的就是 ./result.txt
综上所述，目前应该是这种语法采用的较多一些
