Linux命令学习总结：详解reboot命令

  [root@DB-Server ~]# reboot --help  usage: reboot [-n] [-w] [-d] [-f] [-h] [-i]      -n: don't sync before halting the system      -w: only write a wtmp reboot record and exit.      -d: don't write a wtmp record.      -f: force halt/reboot, don't call shutdown.      -h: put harddisks in standby mode.      -i: shut down all network interfaces.

  [root@DB-Server ~]# man reboot  HALT(8)        Linux System Administrators Manual       HALT(8)     NAME      halt, reboot, poweroff - stop the system.     SYNOPSIS      /sbin/halt [-n] [-w] [-d] [-f] [-i] [-p] [-h]      /sbin/reboot [-n] [-w] [-d] [-f] [-i]      /sbin/poweroff [-n] [-w] [-d] [-f] [-i] [-h]     DESCRIPTION      Halt notes that the system is being brought down in the file /var/log/wtmp, and then either tells the kernel to halt, reboot or poweroff the system.         If halt or reboot is called when the system is not in runlevel 0 or 6, in other words when its running normally, shutdown will be invoked instead (with      the -h or -r flag). For more info see the shutdown(8) manpage.         The rest of this manpage describes the behaviour in runlevels 0 and 6, that is when the systems shutdown scripts are being run.     OPTIONS      -n   Dont sync before reboot or halt. Note that the kernel and storage drivers may still sync.         -w   Dont actually reboot or halt but only write the wtmp record (in the /var/log/wtmp file).         -d   Dont write the wtmp record. The -n flag implies -d.         -f   Force halt or reboot, dont call shutdown(8).         -i   Shut down all network interfaces just before halt or reboot.         -h   Put all harddrives on the system in standby mode just before halt or poweroff.         -p   When halting the system, do a poweroff. This is the default when halt is called as poweroff.     DIAGNOSTICS      If youre not the superuser, you will get the message must be superuser? Users logged in locally on the console can call halt, reboot, and poweroff      without supplying the root password, due to pam_console (8).     NOTES      Under older sysvinit releases , reboot and halt should never be called directly. From release 2.74 on halt and reboot invoke shutdown(8) if the system is      not in runlevel 0 or 6. This means that if halt or reboot cannot find out the current runlevel (for example, when /var/run/utmp hasnt been initialized      correctly) shutdown will be called, which might not be what you want. Use the -f flag if you want to do a hard halt or reboot.         The -h flag puts all harddisks in standby mode just before halt or poweroff. Right now this is only implemented for IDE drives. A side effect of putting      the drive in standby mode is that the write cache on the disk is flushed. This is important for IDE drives, since the kernel doesnt flush the write-cache      itself before poweroff.         The halt program uses /proc/ide/hd* to find all IDE disk devices, which means that /proc needs to be mounted when halt or poweroff is called or the -h      switch will do nothing.     AUTHOR      Miquel van Smoorenburg, miquels@cistron.nl     SEE ALSO      shutdown(8), init(8), pam_console(8)                      Nov 6, 2001             HALT(8)  (END)

   [root@DB-Server ~]# reboot -f

  [root@DB-Server ~]# reboot -i     Broadcast message from root (pts/1) (Mon Jul 28 11:31:28 2014):     The system is going down for reboot NOW!

  [root@DB-Server ~]# reboot -n     Broadcast message from root (pts/1) (Mon Jul 28 11:33:57 2014):     The system is going down for reboot NOW!

  [root@DB-Server ~]# reboot -d     Broadcast message from root (pts/2) (Mon Jul 28 11:23:26 2014):     The system is going down for reboot NOW!