Visit Our UNIX and Linux User Community

Linux and UNIX Man Pages

Test Your Knowledge in Computers #184
Difficulty: Easy
Less than 4% of those surveyed at UNIX.com indicated that csh was their most useful shell.
True or False?
Linux & Unix Commands - Search Man Pages

reboot(8) [opendarwin man page]

REBOOT(8)						    BSD System Manager's Manual 						 REBOOT(8)

NAME
reboot, halt -- stopping and restarting the system SYNOPSIS
halt [-lnq] reboot [-lnq] DESCRIPTION
The halt and reboot utilities flush the file system cache to disk, send all running processes a SIGTERM (and subsequently a SIGKILL) and, respectively, halt or restart the system. The action is logged, including entering a shutdown record into the wtmp(5) file. The options are as follows: -l The halt or reboot is not logged to the system log. This option is intended for applications such as shutdown(8), that call reboot or halt and log this themselves. -n The file system cache is not flushed. This option should probably not be used. -q The system is halted or restarted quickly and ungracefully, and only the flushing of the file system cache is performed (if the -n option is not specified). This option should probably not be used. Normally, the shutdown(8) utility is used when the system needs to be halted or restarted, giving users advance warning of their impending doom and cleanly terminating specific programs. SEE ALSO
wtmp(5), shutdown(8), sync(8) HISTORY
A reboot utility appeared in Version 6 AT&T UNIX. BSD
June 9, 1993 BSD

Check Out this Related Man Page

REBOOT(8)						    BSD System Manager's Manual 						 REBOOT(8)

NAME
halt, reboot -- stopping and restarting the system SYNOPSIS
halt [-lnqu] reboot [-lnq] DESCRIPTION
The halt and reboot utilities flush the file system cache to disk, send all running processes a SIGTERM (and subsequently a SIGKILL) and, respectively, halt or restart the system. The action is logged, including entering a shutdown record into the wtmp(5) file. When the system is halted with the halt command, the system is powered off. The options are as follows: -l The halt or reboot is not recorded in the system log. This option is intended for applications such as shutdown(8), that call reboot or halt and log this themselves. -n The file system cache is not flushed. This option should probably not be used. -q The system is halted or restarted quickly and ungracefully, and only the flushing of the file system cache is performed (if the -n option is not specified). This option should probably not be used. -u The system is halted up until the point of removing system power, but waits before removing power for 5 minutes so that an external UPS (uninterruptible power supply) can forcibly remove power. This simulates a dirty shutdown to permit a later automatic power on. OS X uses this mode automatically with supported UPSs in emergency shutdowns. Normally, the shutdown(8) utility is used when the system needs to be halted or restarted, giving users advance warning of their impending doom and cleanly terminating specific programs. SIGTERM TO SIGKILL INTERVAL
The SIGKILL will follow the SIGTERM by an intentionally indeterminate period of time. Programs are expected to take only enough time to flush all dirty data and exit. Developers are encouraged to file a bug with the OS vendor, should they encounter an issue with this func- tionality. SEE ALSO
wtmp(5), shutdown(8), sync(8) HISTORY
A reboot utility appeared in Version 6 AT&T UNIX. BSD
June 9, 1993 BSD

15 More Discussions You Might Find Interesting

1. Cybersecurity

UNIX error log

A system administration utility has recently been installed at the SCO Openserver (UNIX) servers of our bank. While receiving the error log files of this utility, we have noted the following warning messages: <?xml:namespace prefix = o ns = "urn:schemas-microsoft-com:office:office" /> · ... (3 Replies)
Discussion started by: eysheikah
3 Replies

2. SCO

vi editor not displaying?

Hi guys, I have changed some path in the vi .profile and then i shutdown the system and when i reboot it i was unable to use vi. It is showing vi not found.Likewise for few other commands also. How to solve this problem and make vi work again. Plz. do provide the answer it is... (3 Replies)
Discussion started by: ananthu_m
3 Replies

3. UNIX for Dummies Questions & Answers

Runtime Error...

My system did stay appears the error Run Time Library Error. What itīs? When the error appear, iīve to reboot my system and lost all I did. Is there the UNIX System problem? Please. I need help!!! (4 Replies)
Discussion started by: marpin
4 Replies

4. UNIX for Dummies Questions & Answers

System Startup Time

Hi all, Can anyone tell me how to find the System Startup time. Currently I am using "who -b" to get last reboot time. I wanted to know is there any log file for SCO Openserver 5, in which all this sort of imformations are kept. I have tried searching the forum with words like "WHO... (6 Replies)
Discussion started by: shoeb_syed
6 Replies

5. UNIX for Advanced & Expert Users

shutdown and reboot unix server

Hi, please could someone advise the best command to shutdown and then for it to reboot back online again. Note: I shall be doing this from a telent session. regards venhart (3 Replies)
Discussion started by: venhart
3 Replies

6. Filesystems, Disks and Memory

Corrupted disk on reboot

Could someone please help me. Users were unable to access SCO Server. Attempted to reboot the machine and following error was reported: UX: vxfs mount: ERROR: /dev/dsk/c1b0t3d0s1 is corrupted, needs checking UX: vxfs mount: ERROR: /dev/dsk/c1b0t3d0s2 is corrupted, needs checking etc. ... (4 Replies)
Discussion started by: mandarin
4 Replies

7. Solaris

digiconsole

I have a digiconsole server to manage solaris servers. Now i need to shutdown/reboot this digiconsole. I am wondering is it different to shutdown/reboot the digiconsole compared to normal server ? if so anybody please suggest me how to do that. Does shutting down and rebooting digiconsole affect... (4 Replies)
Discussion started by: lramsb4u
4 Replies

8. AIX

Finding Root cause of AIX server reboot itself

Hi, please explain that how to find the rootcause of aix servers reboot itself. Which log or commands should be used to analyse the reboot incident? Please explain in detail. (3 Replies)
Discussion started by: cyberkingjk
3 Replies

9. Solaris

Any specific time to reboot the sun server to avoid unplanned outage ??

Hi, Would like to know the uptime or specific time limit to reboot the sun microsystem to avoid unplanned outage. Regards,Tarun (9 Replies)
Discussion started by: taruntan
9 Replies

10. UNIX for Advanced & Expert Users

Popup needed while reboot - for confirmation

Hi all, I need something like a pop-up while clicking on shutdown button or reboot button in GUI and also while running the command reboot / shutdown / init it should ask some confirmation message.. Do you want to do so..and so. How can i make this possible ? . (4 Replies)
Discussion started by: linuxadmin
4 Replies

11. Linux

Switching between Windows and UNIX

I have both UNIX and Windows on my system. While booting it asks for me to select an OS. Once I log in to an OS, then to log in to another OS, there is no direct method. I need to shutdown and again start to select another OS. May I know any method to directly switch between the two. (23 Replies)
Discussion started by: ravisingh
23 Replies

12. AIX

Automation of AIX LPARs reboot

Hello Everyone, Can you please help me with the following questions regarding recycling LPARs. 1) Is it recommended to automate the reboot of AIX LPARs with a script ? i mean we've few App LPARs and Database LPARs. we would like to bring down LPARs on last sunday of every month for about 1... (4 Replies)
Discussion started by: System Admin 77
4 Replies

13. Hardware

Multi-bit ECC Error on X4100 M2 Server Sun Fire

I have a problem, I have been installing Redhat Interprise Linux on X4100 M2 Server, when system is reboot after install, the server is restart (reboot) again (alias unlimited). The bios system show message error "Multi-bit ECC Error" and "bank interleave requested but not enable" I have... (5 Replies)
Discussion started by: hhaswan
5 Replies

14. Shell Programming and Scripting

Inotifywait restart script prevents reboot when started

Hi, maybe someone could help me optimizing this little script. It works so far, but when running, reboot does not work. If kill inotifywait reboot from shell works. I think some optimization is required here. This script starts at the end of the boot process, from an external device and... (3 Replies)
Discussion started by: lowmaster
3 Replies

15. UNIX for Beginners Questions & Answers

Can I trace who asked for reboot

Hi, I have an unexpected reboot happening on a Debian 9.9 server. Yesterday 2019-12-01 at 8:30:34 a reboot happened without me or my team being aware: /var/log/syslog:Dec 1 08:30:34 xxxx shutdown: shutting down for system reboot /var/log/syslog:Dec 1 08:30:34 xxxx init: Switching to... (4 Replies)
Discussion started by: chebarbudo
4 Replies

Featured Tech Videos