Difference between system uptime and last boot time. Post: 302521359

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Top Forums UNIX for Dummies Questions & Answers Difference between system uptime and last boot time. Post 302521359 by pinga123 on Wednesday 11th of May 2011 03:57:14 AM

05-11-2011

Registered User

Difference between system uptime and last boot time.

My Linux system was last rebooted few hours ago.

But it seems little confusing for me to figure out the exact reason behind it.

I guess following command should justify what i meant to say.

Code:

# date
Wed May 11 13:22:49 IST 2011
# last | grep "May 10"
reboot   system boot  2.6.18-194.el5   Tue May 10 17:35          (19:46)
root     pts/1        XXXX    Tue May 10 17:24 - 18:18  (00:53)
# last | grep "May 11"
oracle   pts/2       XXX Wed May 11 13:08   still logged in
root     pts/1        XXX Wed May 11 13:07   still logged in
root     pts/0        XXX Wed May 11 13:00   still logged in
root     pts/5        XXX    Wed May 11 12:59 - 12:59  (00:00)
root     pts/4        XXX    Wed May 11 12:58 - 12:59  (00:00)
oracle   pts/3        XXX Wed May 11 12:44   still logged in
root     pts/2        XXXX    Wed May 11 12:42 - 12:59  (00:16)
root     pts/1        XXX    Wed May 11 12:41 - 12:59  (00:18)
root     pts/0        XXXX    Wed May 11 12:38 - 12:59  (00:20)
# uptime
 13:22:40 up 47 min,  4 users,  load average: 1.23, 2.48, 2.66
# who -b
         system boot  2011-05-10 17:35

You can see the current system date is Wed May 11 13:22:49 IST 2011
and last boot date is
system boot 2011-05-10 17:35

My question is Why the uptime is saying that the system is up since last 47 min.It should be more than 1 day if i m not wrong.

Correct me.

pinga123

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uptime

UPTIME(1)							   User Commands							 UPTIME(1)

NAME

       uptime - Tell how long the system has been running.

SYNOPSIS

       uptime [options]

DESCRIPTION

       uptime  gives  a one line display of the following information.	The current time, how long the system has been running, how many users are
       currently logged on, and the system load averages for the past 1, 5, and 15 minutes.

       This is the same information contained in the header line displayed by w(1).

       System load averages is the average number of processes that are either in a runnable or uninterruptable state.	A process  in  a  runnable
       state is either using the CPU or waiting to use the CPU.  A process in uninterruptable state is waiting for some I/O access, eg waiting for
       disk.  The averages are taken over the three time intervals.  Load averages are not normalized for the number of CPUs in  a  system,  so  a
       load average of 1 means a single CPU system is loaded all the time while on a 4 CPU system it means it was idle 75% of the time.

OPTIONS

       -p, --pretty
	      show uptime in pretty format

       -h, --help
	      display this help text

       -s, --since
	      system up since, in yyyy-mm-dd HH:MM:SS format

       -V, --version
	      display version information and exit

FILES

       /var/run/utmp
	      information about who is currently logged on

       /proc  process information

AUTHORS

       uptime was written by Larry Greenfield <greenfie@gauss.rutgers.edu> and Michael K. Johnson <johnsonm@sunsite.unc.edu>

SEE ALSO

       ps(1), top(1), utmp(5), w(1)

REPORTING BUGS

       Please send bug reports to <procps@freelists.org>

procps-ng							   December 2012							 UPTIME(1)