linux_reference_general.md

Linux Reference General

1. Check kernel version

uname -a (-a = all)

2. Check current IP

ifconfig
ip addr
ip addr show eno2 # specifically for eno2

3. Amount of free disk space

df
df -ah # a - all, h - human readable

4. Service management

systemd

sudo systemctl enable service
sudo systemctl start service
sudo systemctl enable --now service (enables and starts)
sudo systemctl status service
sudo systemctl stop service
sudo systemctl disable service

legacy

service udev status
service udev start
...

5. Check size of directory

du ./folder
du -sh ./folder # s - summarize, h - human readable

6. Check open ports

netstat
netstat -tulpn # tcp/udp 

7. Check to check resource usage

specific process

ps aux | grep process_name

general overview

top
htop

8. Mounting devices

mount /dev/sda2 /mnt/usb
mount # list mounts

Note: boot mounts are set in fstab.

9. Man pages

man <command>