sess auto-save

sess auto-save <name> [--interval N]
sess auto-save <name> --stop

Starts (or stops) a background process that periodically re-captures and re-saves <name> under itself, so recent state isn't lost if you forget to run sess save yourself before closing the terminal.

sess auto-save backend-debug                # every [autosave] interval seconds (default 30)
sess auto-save backend-debug --interval 60  # override the interval for this one
sess auto-save backend-debug --stop         # stop it

The session must already be running (sess auto-save doesn't start one — use sess start <name> --auto-save for that in one step).

The loop exits on its own once the tmux session it's watching disappears, and it preserves any persisted environment variables from the last manual sess save rather than dropping them.

See Configuration to make this the default for every new session instead of calling it separately.

Known limitation: the background process is a plain detached child, not a fully daemonized one (no double-fork / setsid). Robust on most Linux setups, but see Limitations.