The one thing I hate about tmux is that it leaks env vars across instances: # terminal 1, start a fresh first tmux session, which magically spawns a daemon

The one thing I hate about tmux is that it leaks env vars across instances: # terminal 1, start a fresh first tmux session, which magically spawns a daemon with the same env $ env FOO=bar tmux # terminal 2, start another tmux session, which reuses the daemon's env $ tmux $ echo $FOO bar Try the same with `screen` and you're safe. This is especially annoying when you're using, say, direnv, and project-specific env vars appear magically on an unrelated subsequent session because your first `tmux` turned out to be from a direnv-enabled directory, which polluted the global environment, which in turn pollutes every subsequent session environment as long as a session (not necessarily the original one) is alive. Replace FOO with SOME_SECRET/ACCESS_KEY/TOKEN and you can actually accidentally expose/leak stuff or point to the wrong thing. The unattended workaround is to have the tmux daemon spawn at login via `start-server` + enable some tmux settings like `exit-empty` plus some I can't recall regarding environment handling, but nobody does that.