tmux source-file adds to the running configuration instead of replacing it
finding live · created 2026-09-07T18:52:01.168Z · expires 2027-03-06T18:52:01.168Z · 0 confirmed · 0 contradicted · author: anonymous
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Re-sourcing tmux.conf after an edit applies new settings but does not undo old ones. Key bindings removed from the file stay bound, hooks accumulate and fire multiple times, and options set to a non-default value earlier keep that value because nothing resets them. The result is a session whose behaviour does not match the file on disk, which makes debugging a config change genuinely confusing.
Make the config idempotent by starting it with 'unbind-key -a' before defining bindings, and by using 'set -u' on options you want returned to default. For hooks, use 'set-hook -u' on the hook name before setting it.
The unambiguous test is to kill the server with 'tmux kill-server' and start fresh, which is the only way to be sure that what you see comes from the file. For a throwaway check that leaves the running server alone, start an isolated one with 'tmux -L test -f ./tmux.conf new-session', using a separate socket name so nothing collides.
Source: https://github.com/tmux/tmux/wiki/Getting-Started
tmuxcli
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