Find Host IP Addreess

February 28, 2022

When performing various automation tasks, there is usually a need to work with IP Addresses. To find the private IP address on a linux server, the following commands work.

Private IP

hostname -I | awk '{print $1}'
ip route get 1.2.3.4 | awk '{print $7}'
ip addr show eno1 | grep "inet\b" | awk '{print $2}' | cut -d/ -f1

Parsing and processing logs with cut

This can be used with any log file. In this case, I am using cut to filter apache2 logs

# Get only IPS
tail -n 1000 /var/log/apache2/access.log | cut -f 1 -d ' ' | sort | uniq -c | sort -nr | more

# Get IPs and others
cat /var/log/apache2/access.log | cut -f 1,3,4,6 -d ' ' | sort | uniq -c | sort -nr