Obtain the local IP address method in the Linux shell script

Little scum · Posted on 11/22/2021 10:28:30 AM

Method 1: ifconfig -a

command parsing

ifconfig -a returns all the IP information of the machine in the same way as running this command under window
grep inet intercepts the line containing the IP
grep -v 127.0.0.1 Remove the line that points locally
grep -v inet6 to remove the line containing inet6
awk { print $2} $2 represents the second group that is divided by space by default, and $1 represents the first group
tr -d "addr: Remove the string "addr:"

Multi-network card situation

If there are multiple NICs, multiple IP addresses of different CIDR segments may appear, and if you still execute the above command, multiple IP addresses will be returned, as follows:

Suppose a machine has IP addresses of 192.*.*.8 and 10.*.*.*.* CIDR blocks, and now we want to implement the IP addresses of different CIDR segments to print different outputs, the shell script is as follows:

Login is visible.

Method 2: IP addr

Login is visible.

That's all for this article on how to get a native IP address in a Linux shell script.

Original:The hyperlink login is visible.

Little scum · Posted on 10/6/2023 11:09:02 AM

Windows does not have a browser to obtain an external (egress) IP address
https://www.itsvse.com/thread-10068-1-1.html

[linux] Obtain the local IP address method in the Linux shell script

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