Useful Commands in Linux (Debian)

1. System Version

Check which Debian version matches your /etc/debian_version

cat /etc/debian_version
uname -a
lsb_release -a

2. Disk Usage

Check free space on your drives (human readable).

df -h

3. Memory Usage

Check RAM usage (in MB).

free -m

4. Network Info

Show IP addresses and network interfaces.

ip a

5. System Logs

View the latest system logs and errors.

sudo journalctl -xe