Execute command to take out the IP address of eth0 in Linux

Method One: Cut command

#ifconfig eth0|grep ' inet addr ' |cut-d ":-f2|cut-d" "-f1192.168.1.11

Method Two: awk command

1. Use the awk command two times

#ifconfig eth0 |grep ' inet addr ' |awk-f ': ' {print $} ' |awk ' {print $} ' 192.168.1.11

2. Use the awk command again

Error wording:

# ifconfig eth0|grep ' inet addr ' |awk-f [:] ' {print $13} ' awk::]awk: ^ syntax error

Correct wording:

#ifconfig eth0|grep ' inet addr ' |awk-f ' [:] ' {print $13} ' 192.168.1.11

It can also be:

#ifconfig eth0|sed-n ' 2p ' |awk-f ' [:] ' {print $ (NF-6)} '

NF represents the last line in awk, if you do not understand the minus 6 after NF, you can view it separately

[[email protected] lele]# ifconfig eth0|sed -n  ' 2p '            inet addr:192.168.1.11  bcast:192.168.1.255  mask :255.255.255.0[[email protected] lele]# ifconfig eth0|sed -n  ' 2p ' |awk -F   ' [ :] '   ' {print $ (NF)} ' 255.255.255.0[[email protected] lele]# ifconfig  eth0|sed -n  ' 2p ' |awk -f  ' [ :] '   ' {print $ (NF-1)} ' mask[[email  protected] lele]# ifconfig eth0|sed -n  ' 2p ' |awk -f  ' [ :] '   ' {print  $ (NF-2)} ' [[email protected] lele]# ifconfig eth0|sed -n  ' 2p ' |awk -F   ' [ :] '   ' {print $ (NF-3)} ' 192.168.1.255[[email protected] lele]# ifconfig  eth0|sed -n  ' 2p ' |awk -f  ' [ :] '   ' {print $ (NF-4)} ' bcast[[email  Protected] lele]# ifconfig eth0|sed -n  ' 2p ' |awk -f  ' [ :] '   ' {print $ (NF-5)} ' [[email  protected] lele]# ifconfig eth0|sed -n  ' 2p ' |awk -f  ' [ :] '   ' {print  $ (NF-6)} ' 192.168.1.11

3.awk multiple Separators

#ifconfig eth0|sed-n ' 2p ' |awk-f ' [:]+ ' {print $4} ' 192.168.1.11#ifconfig eth0|awk-f ' [:]+ ' nr==2 {print $4} ' 192.168. 1.11

' + ' means repeating the preceding multiple characters, combining multiple spaces or colons into one character.

Execute command to take out the IP address of eth0 in Linux