tmux for persistent sessions in Linux CLI - Practice Problems & Coding Challenges

Challenge - 5 Problems

💻 Command Output

intermediate

What is the output of listing tmux sessions?

You have started two tmux sessions named work and play. What will be the output of the command tmux ls?

Linux CLI

tmux ls

A

work: 1 windows (created Wed Jun 14 10:00:00 2023) [80x24]
play: 1 windows (created Wed Jun 14 10:05:00 2023) [80x24]

B

work
play

C No sessions found

D tmux: command not found

💡 Hint

Think about how tmux shows session details with names and window counts.

The command tmux ls lists all active tmux sessions with their names, number of windows, creation time, and size.

💻 Command Output

intermediate

What happens when you detach a tmux session?

You are inside a tmux session named dev. You run the command tmux detach. What is the immediate effect?

Linux CLI

tmux detach

A The terminal closes immediately.

B The tmux session is terminated and all processes inside it stop.

C You get an error: 'detach: unknown command'

D You exit the tmux session but it keeps running in the background.

💡 Hint

Detaching means leaving the session without stopping it.

Detaching a tmux session leaves it running in the background so you can reconnect later.

📝 Syntax

advanced

Which command attaches to a tmux session named 'project'?

You want to attach to an existing tmux session called project. Which command is correct?

A tmux connect project

B tmux start project

C tmux attach -t project

D tmux open -s project

💡 Hint

The attach command uses the -t option to specify the target session.

The correct syntax to attach to a session is tmux attach -t session_name.

🚀 Application

advanced

How to create a new tmux session named 'test' with a window running 'top'?

You want to start a new tmux session named test and immediately run the command top inside it. Which command achieves this?

A tmux new -s test 'top'

B tmux create test top

C tmux start -n test top

D tmux new-session -s test top

💡 Hint

Use the new session command with -s for session name and pass the command in quotes.

The command tmux new -s test 'top' creates a new session named 'test' and runs 'top' inside it.

🔧 Debug

expert

Why does this tmux command fail with 'unknown option' error?

You run the command tmux attach-session -d -t mysession but get an error: tmux: unknown option: -d. What is the reason?

Linux CLI

tmux attach-session -d -t mysession

A The session 'mysession' does not exist, causing the error.

B The -d option is not valid for attach-session; it belongs to new-session.

C You need to run tmux as root to use the -d option.

D The command should be run inside an existing tmux session.

💡 Hint

Check which commands support the -d option in tmux.

The -d option is used with tmux new-session to start detached. It is not valid with attach-session.