Reference: Top 10 Linux Job Interview Questions

How to check the kernel version of a Linux system?

# 
uname -a
# 
uname -v
# 
uname -r

How to see the current IP address on Linux?

ifconfig

How to check for free disk space in Linux?

df -h

How to see if a Linux service is running?

systemctl

service

How to check the size of a directory in Linux?

du -sh .

How to check for open ports in Linux?

How to check Linux process information (CPU usage, memory, user information, etc.)?

How to deal with mounts in Linux

Man pages

Other resources