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Full Discussion: Difference between uptime and who -b
Operating Systems Linux Red Hat Difference between uptime and who -b Post 302950351 by agent.kgb on Thursday 23rd of July 2015 04:43:27 PM
Old 07-23-2015
Linux uptime command looks at file /proc/uptime and last reboot shows the reboot entry from /var/log/wtmp. The reboot entry is placed (I suppose) by init command and /proc/uptime shows uptime from the kernel's point of view - from starting the 1st CPU. Nobody knows your system better then you, but I would trust the output of uptime. wtmp file is easy to manipulate and it starts on the same date, as it shows last reboot. It may be, that last doesn't find any reboot entries at all and just reports the first entry of the file as last reboot time.
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LEARN ABOUT MINIX

reboot

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

NAME

       reboot - reboot the system immediately

SYNOPSIS

       reboot [-f]

DESCRIPTION

       Reboot  can  be	used  to  reboot  the  system  after  installing a new kernel.	It does not inform the users, but does log it's actions in
       /usr/adm/wtmp and /usr/adm/authlog.  The system is then rebooted with the reboot(2) systemcall.

       If the -f flag is not given then all processes are sent terminate signals to give them a chance to die peacefully before the reboot() call.

       If the wtmp file exists, reboot logs itself as if it were a shutdown.  This is done to prevent last(1) from talking  about  system-crashes.
       Reboot is registered as is in the authlog file.

       Reboot can only be executed by the super-user.  Any other caller will be refused, either by reboot(8) or by reboot(2).

SEE ALSO

       reboot(2), shutdown(8), halt(8), boot(8).

BUGS

       The  error message's given by reboot are not always useful.  There are several routines that can fail, but which are not fatal for the pro-
       gram.

AUTHOR

       Edvard Tuinder (v892231@si.hhs.NL)

																	 REBOOT(8)
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