I have just installed tmux and vlock. When I try to perform the lock-session command, my terminal flashes and then nothing happens. Is there something in my .tmux.conf that must be added to tell tmux that I have a locking utility? If so, what is it?

In other words:

How can I do lock-session with tmux?

2 Answers 2


Put the following in the .tmux.conf:

set-option -g lock-command vlock
  • Just in case, the package/program vlock may not be installed by default (e.g.Ubuntu 20.04.5 LTS). The following, usually, should achieve it: sudo apt-get install vlock;.
    – Artfaith
    Commented Dec 9, 2022 at 9:20

I have the following tmux.conf lines:

# Enable locking
set -g lock-command vlock
set -g lock-after-time 0 # Seconds; 0 = never
bind L lock-session

Pressing [prefix] + L (capital) locks my session.

Related How can I lock just the current client?

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