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  1. #1
    "shutdown -fh now" vs. the power button
    Hi all,

    from time to time, I use 'shutdown -fh now' to shut down my panther box, but most often just the standard point-and-click way.
    Now I wonder: are there any differences in the way both routines behave?
    I've already seen that the screen fades out more slowly using the GUI. It also seems as if the shell-option needs a bit more time once the screen has gone blue.

    Anyone has any more details on this (specifically on the procedure when using the power button)?

    Thank you

  2. #2

    rman's Avatar
    Member Since
    Dec 24, 2002
    Los Angeles, California
    2 x 3.0GHz Quad-Core, 6GB OS X 10.6.8 | 15in MacBook Pro 2.2GHz OS X 10.6.8 | 64GB iPad 2 WiFi
    Here is my guess. When you are doing the command line shutdown. I believe that you are doing a fast halt. Whereas the GUI shutdown may not be doing the fast halt.
    Life isn't about waiting for the storm to pass, It's about learning to dance in the rain!

  3. #3

    witeshark's Avatar
    Member Since
    Mar 09, 2004
    Miami FL
    G4 1Ghz OS X 10.4.7
    SHUTDOWN(8) BSD System Manager's Manual SHUTDOWN(8)

    shutdown - close down the system at a given time

    shutdown [-] [-fhkrn] time [warning-message ...]

    Shutdown provides an automated shutdown procedure for super-users to
    nicely notify users when the system is shutting down, saving them from
    system administrators, hackers, and gurus, who would otherwise not bother
    with such niceties.

    Available friendlinesses:

    -f Shutdown arranges, in the manner of fastboot(8), for the file sys-
    tems not to be checked on reboot.

    -h The system is halted at the specified time when shutdown execs

    -k Kick every body off. The -k option does not actually halt the sys-
    tem, but leaves the system multi-user with logins disabled (for all
    but super-user).

    -n Prevent the normal sync(2) before stopping.

    -r Shutdown execs reboot(8) at the specified time.

    time Time is the time at which shutdown will bring the system down and
    may be the word now (indicating an immediate shutdown) or specify a
    future time in one of two formats: +number, or yymmddhhmm, where
    the year, month, and day may be defaulted to the current system
    values. The first form brings the system down in number minutes
    and the second at the absolute time specified.

    Any other arguments comprise the warning message that is broadcast
    to users currently logged into the system.

    - If `-' is supplied as an option, the warning message is read from
    the standard input.
    At intervals, becoming more frequent as apocalypse approaches and start-
    ing at ten hours before shutdown, warning messages are displayed on the
    terminals of all users logged in. Five minutes before shutdown, or imme-
    diately if shutdown is in less than 5 minutes, logins are disabled by
    creating /etc/nologin and copying the warning message there. If this
    file exists when a user attempts to log in, login(1) prints its contents
    and exits. The file is removed just before shutdown exits.

    At shutdown time a message is written in the system log, containing the
    time of shutdown, who initiated the shutdown and the reason. A terminate
    signal is then sent to init to bring the system down to single-user state
    (depending on above options). 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 any-
    thing else).

    /etc/nologin tells login not to let anyone log in
    /fastboot tells rc(8) not to run fsck when rebooting

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