Use the Shell command line to obtain the local IP address

Enterifconfigunder mac or enter# underlinux##ip acan get our network card information. But usually, what we need to check is our IP address, and we don't need so much information. So, I want to extract this information.

mac ifconfig The following implementation

We enter

ifconfigand we will get a large piece of information. We can see that the string in front of the IP address we want isinet

So, let’s optimize the code as follows:

ifconfig | grep inet

Get the following information:

inet 127.0.0.1 netmask 0xff000000 inet6 ::1 prefixlen 128 inet6 fe80::1%lo0 prefixlen 64 scopeid 0x1 inet6 fe80::85e:9798:4041:1717%en0 prefixlen 64 secured scopeid 0x4 inet 192.168.12.139 netmask 0xffffff00 broadcast 192.168.12.255 inet6 fd86:415c:c5f9::c72:1c02:f044:65de prefixlen 64 autoconf secured inet6 fd86:415c:c5f9::cd76:7bb1:f77d:46f0 prefixlen 64 deprecated autoconf temporary inet6 fd86:415c:c5f9::508d:685b:6a66:b3ce prefixlen 64 autoconf temporary inet6 fe80::9446:a1ff:fe5e:9b8f%awdl0 prefixlen 64 scopeid 0x9 inet6 fe80::9d71:6fa:3da5:9cb6%utun0 prefixlen 64 scopeid 0xa

Okay, it’s been streamlined a lot.

We can get our local IP by excluding the information of

inet6and127

ifconfig | grep inet | grep -v inet6 | grep -v 127

Get

inet 192.168.12.139 netmask 0xffffff00 broadcast 192.168.12.255

The front is a tab character, we don’t care, we separate it with spaces and take the second field to get our IP information

ifconfig | grep inet | grep -v inet6 | grep -v 127 | cut -d ' ' -f2

We can successfully get the other local machine we want IP address.

We create a

getipfile under~/.bin/and usechmod +x ~/.bin/getipto execute it permissions. Then entergetipin the command line to get our local IP.

You need to configure

~/.bin/as an environment variable first. Please refer to this command as a system command, which can be executed at any time

Implement the script to obtain the local IP under linux centos 7

linuxDo not use theifconfigcommand to obtain information, but useip ato obtain.

So we modified the above command to

ip a | grep inet | grep -v inet6 | grep -v 127 | sed 's/^[ \t]*//g' | cut -d ' ' -f2

Since the front of the information obtained in Linux is not a tab character but a space, we added

sed ' s/^[ \t]*//g'to remove leading spaces.

Other logic is the same. If you like, you can also make it global, and the logic is basically the same as that of Mac.

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