Linux Job Interview Questions

1. How can you see which kernel version a system is currently running?

uname -a  // Show hostname, current version, current release

uname -v  //Show current version

uname -r  // Show current release

2.How can you check a system’s current IP address?

ifconfig

ip addr show

ip addr show eth0

1. How do you check for free disk space?

df -ah

1. How dow you manage services on a system?

service <service name> status

systemctl status <service name>

1. How would you check the size of a directory’s contents on disk?

du -sh <directory name>

1. How would you check for open ports on a Linux machine?

netstat

sudo netstat  -tulpn

1. How do you check CPU usage for a process?

ps aux |grep <process name> 

top

htop

1. Dealing with Mounts

ls /mnt

mount <device/network drive> <mount point>

/etc/fstab

1. How do you look up something you don’t know?

man <command>

<command> --h

google

Written on March 27, 2017