options] [--] [
Locate the first available virtual terminal (VT) and run command with any arguments given. If no command is specified, the shell $SHELL is started.
Required before the command name to pass options to the command.
Use the specified VT number instead of the first available. You must have write access to vt.
Run the command as a login shell, prepending a dash (-) to the command name.
Switch to the new VT when the command is started.
Determine the owner of the current VT and log in as that user. You must be root to use this option, which is also suitable for calling by init. Don’t use with -l.
Wait for the command to complete. If used with -s, switch back to the controlling terminal when the command is done.