learntmux.dev
Task 8 of 8
Level 1 · BasicsOverview
  1. 1Start your first session
  2. 2The prefix key and new windows
  3. 3Find any key with the help list
  4. 4Run commands from the command prompt
  5. 5Detach and come back
  6. 6Read the session list and juggle sessions
  7. 7Split the window into panes
  8. 8Split with flags
  9. 9Move between panes
  10. 10Kill the server
  11. 11Challenge: morning on the build boxchallenge
Level 2 · IntermediateOverview
  1. 1Change the current window
  2. 2Rename the session and a window
  3. 3Kill a pane, a window and a session
  4. 4Zoom a pane
  5. 5Resize panes
  6. 6Apply window layouts
  7. 7Mark and swap panes
  8. 8Move and renumber windows
  9. 9Browse in tree mode
  10. 10Tag and kill from the tree
  11. 11Kick out a stale client
  12. 12Challenge: tidy a messy sessionchallenge
Level 3 · AdvancedOverview
  1. 1Copy text in copy mode
  2. 2Scroll, search the scrollback and paste
  3. 3Choose and delete buffers in buffer mode
  4. 4Name, save and load buffers
  5. 5Find a window by its content or name
  6. 6Use the mouse
  7. 7Break out, join and send keys
  8. 8Challenge: recover the secret from the logschallenge
Level 4 · ConfigureOverview
  1. 1Show, set and unset options
  2. 2Write the configuration file
  3. 3Add and remove key bindings
  4. 4Change the prefix key
  5. 5Customize the status line
  6. 6Formats and embedded styles
  7. 7Embedded shell commands
  8. 8Configure the pane border
  9. 9Use vi keys in copy mode
  10. 10Mouse copying behaviour
  11. 11Challenge: write your own tmux.confchallenge
Cheat sheet
Challenge · no new keys

Challenge: recover the secret from the logs

Goal

Buffer token holds the token, saved to ~/token.txt and pasted into window 0, with the mouse on.

Nothing new. The whole level, in order:

C-b f
find the window
C-b [ then C-r
find the line in its history
C-Space, M-w
copy it
setb -n, saveb
name the buffer and save it
C-b ]
paste it back
set -g mouse on
finish

The catch is the gap between the two searches. find-window reads what a pane shows now, so it finds the crash notice printed last. The token printed earlier and has scrolled off — only copy mode’s search reaches that far back.

Do this

Reach this state:

The window that printed crashed is current, found with C-b f.

The tok- value from its scrollback is copied into a buffer.

That buffer is named token and saved to ~/token.txt.

The token is pasted into the shell in window 0.

The mouse option is on.

Stuck on this one?

This is a live terminal. Typing goes to the machine, including Tab. Press Shift and Tab together to move focus back out to the page.

A real terminal, in this tab

about 15 MB, once

session learn

Done when

not started
  1. A buffer named token holds the tok- value— not done yet
  2. The buffer was saved to ~/token.txt— not done yet
  3. The token was pasted into window 0— not done yet
  4. The mouse option is left enabled— not done yet