Use the Shell command line to obtain the local IP address

Enter ifconfig under mac or enter# under linux ##ip a can 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

ifconfig and we will get a large piece of information. We can see that the string in front of the IP address we want is inet

So, let’s optimize the code as follows:

ifconfig | grep inet

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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

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Okay, it’s been streamlined a lot.

We can get our local IP by excluding the information of

inet6 and 127

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

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Get

    inet 192.168.12.139 netmask 0xffffff00 broadcast 192.168.12.255

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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 &#39; &#39; -f2

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

We create a

getip file under ~/.bin/ and use chmod +x ~/.bin/getip to execute it permissions. Then enter getip in 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

linux Do not use the ifconfig command to obtain information, but use ip a to obtain.

So we modified the above command to

ip a | grep inet | grep -v inet6 | grep -v 127 | sed &#39;s/^[ \t]*//g&#39; | cut -d &#39; &#39; -f2

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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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