4.3BSD-UWisc/man/cat8/shutdown.8

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SHUTDOWN(8)         UNIX Programmer's Manual          SHUTDOWN(8)



NAME
     shutdown - close down the system at a given time

SYNOPSIS
     /etc/shutdown [ -k ] [ -r ] [ -h ] [ -f ] [ -n ] time [
     warning-message ... ]

DESCRIPTION
     _S_h_u_t_d_o_w_n provides an automated shutdown procedure which a
     super-user can use to notify users nicely when the system is
     shutting down, saving them from system administrators, hack-
     ers, and gurus, who would otherwise not bother with
     niceties.

     _T_i_m_e is the time at which _s_h_u_t_d_o_w_n will bring the system
     down and may be the word now (indicating an immediate shut-
     down) or specify a future time in one of two formats:
     +number and hour:min.  The first form brings the system down
     in _n_u_m_b_e_r minutes and the second brings the system down at
     the time of day indicated (as a 24-hour clock).

     At intervals which get closer together as apocalypse
     approaches, warning messages are displayed at the terminals
     of all users on the system.  Five minutes before shutdown,
     or immediately if shutdown is in less than 5 minutes, logins
     are disabled by creating /etc/nologin and writing a message
     there.  If this file exists when a user attempts to log in,
     _l_o_g_i_n(1) prints its contents and exits.  The file is removed
     just before _s_h_u_t_d_o_w_n exits.

     At shutdown time a message is written in the system log,
     containing the time of shutdown, who ran shutdown and the
     reason.  Then a terminate signal is sent to _i_n_i_t to bring
     the system down to single-user state.  Alternatively, if -r,
     -h, or -k was used, then _s_h_u_t_d_o_w_n will exec _r_e_b_o_o_t(8),
     _h_a_l_t(8), or avoid shutting the system down (respectively).
     (If it isn't obvious, -k is to make people _t_h_i_n_k the system
     is going down!)

     With the -f option, _s_h_u_t_d_o_w_n arranges, in the manner of
     _f_a_s_t_b_o_o_t(8), that when the system is rebooted the file sys-
     tems will not be checked.  The -n option prevents the normal
     _s_y_n_c(2) before stopping.

     The time of the shutdown and the warning message are placed
     in /etc/nologin and should be used to inform the users about
     when the system will be back up and why it is going down (or
     anything else).

FILES
     /etc/nologin   tells login not to let anyone log in




Printed 12/27/86          May 26, 1986                          1






SHUTDOWN(8)         UNIX Programmer's Manual          SHUTDOWN(8)



SEE ALSO
     login(1), reboot(8), fastboot(8)

BUGS
     Only allows you to kill the system between now and 23:59 if
     you use the absolute time for shutdown.

















































Printed 12/27/86          May 26, 1986                          2