Quick Bash Tricks to Retrieve Server IP Addresses with awk, grep, and sed

Here are several scripts to obtain the IP address of the local server using common Linux command-line tools.

Get IP using awk

# ifconfig ens33 | awk 'NR==2{print $2}'
192.168.154.5

Get IP using grep

# ifconfig ens33 | egrep -o "([0-9]{1,3}\.){3}[0-9]{1,3}" | head -n 1
192.168.154.5

Get IP using sed

# ifconfig ens33 | sed -n '/inet /p' | sed 's/inet \([0-9.]\+\).*/\1/' | tr -d ' '
192.168.154.5

Get all interface IPs

# cat ip.sh
#!/bin/bash
# Author: cn-Linuxer

ifs=(`ifconfig | grep "^e" | awk -F: '{print $1}'`)

for i in ${ifs[@]}; do
    echo -e "${i}
\t`ifconfig ${i} | awk 'NR==2{print $2}'`"
 done

# sh ip.sh
ens33
        192.168.154.5
ens35
        192.168.156.5