Pro tips - kdaisho/Blog GitHub Wiki

Here's a list of useful tips when you ssh to your server.

• sudo !!: Executes the previous command with sudo permission
• head prints the first 10 lines of file
• tail prints the last 10 lines of file
• tail -f /var/log/auth.log prints the last lines of auth.log and it updates if new log is created. So you can watch all login attempts in real time.