SSH automation in Bash Scripting - Cheat Sheet & Quick Revision

Recall & Review

beginner

What is SSH automation?

SSH automation means using scripts to connect and run commands on remote computers without typing passwords every time.

beginner

How does SSH key-based authentication help in automation?

It uses a pair of keys (private and public) so you don't need to enter a password each time you connect, making scripts run smoothly.

beginner

What command generates an SSH key pair?

The command is ssh-keygen. It creates a private key and a public key for secure login.

beginner

How do you copy your public SSH key to a remote server?

Use ssh-copy-id user@remote_host. It adds your public key to the server's authorized keys for passwordless login.

beginner

What is a simple bash script example to run a command on a remote server using SSH?

Example:<br>ssh user@remote_host 'ls -l /home/user'<br>This runs the ls -l command on the remote server.

Which command creates an SSH key pair for automation?

A ssh-add

B ssh-copy-id

C ssh-keygen

D scp

ssh-keygen creates the key pair needed for passwordless SSH login.

What does ssh-copy-id do?

A Copies files between computers

B Starts an SSH session

C Generates SSH keys

D Copies your public SSH key to a remote server

ssh-copy-id adds your public key to the remote server's authorized keys.

Why use SSH keys for automation instead of passwords?

A Keys allow passwordless login for scripts

B Keys are easier to remember

C Passwords are more secure

D Keys slow down connection

SSH keys let scripts connect without typing passwords, making automation smooth.

Which command runs uptime on a remote server via SSH?

A ssh user@host uptime

B ssh user@host 'uptime'

C ssh user@host; uptime

D ssh uptime user@host

Use quotes to run commands remotely: ssh user@host 'command'.

What file on the remote server stores authorized public keys?

A ~/.ssh/authorized_keys

B ~/.ssh/config

C ~/.ssh/id_rsa

D ~/.ssh/known_hosts

The authorized_keys file lists public keys allowed to connect.

Explain how to set up SSH automation from scratch.

Think about creating keys, sharing keys, and running commands without passwords.

Describe why SSH automation is useful in scripting and give an example use case.

Consider repetitive tasks on remote machines.