
The "S|s|single" option is handled by systemd (starting rescue.target). And the rescue target basically removes the need for a special debug shell. (Also, there is "systemd.crash_shell=1" for starting a shell if systemd crashes.)
*** NixOS *** NixOS is a Linux distribution based on the purely functional package management system Nix. More information can be found at http://nixos.org/nixos and in the manual in doc/manual.
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