Your half-typed zsh command line

A long command typed at the zsh prompt and not yet run is lost the same way: the window closes, or Ctrl+C clears it. unsent setup zsh also saves that line as you type it, with a few zsh builtins in the same block, so no process starts with the shell and nothing wraps it.

unsent list --agent zsh     # the line a closed window took
unsent list --all --agent zsh   # also lines you cleared with Ctrl+C
unsent restore --agent zsh  # copy the newest one from this folder

A line you run with Enter keeps nothing, because zsh's own history has it (UNSENT_ON_SEND_ZSH=log keeps it). Only the prompt's own line is saved: never a password typed at a sudo, ssh or read -s prompt, which zsh's line editor never sees, never text typed at vared, never a line that starts with a space or matches your HISTORY_IGNORE, and never a line recalled with Up or Ctrl+R that you didn't edit. unsent status zsh says whether the hooks load. If you keep your .zshrc by hand, add eval "$(unsent init zsh)" to it instead of running setup; that costs one process start per shell. bash and fish don't have this yet.