Difference between uptime and who -b Post: 302950347

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Operating Systems Linux Red Hat Difference between uptime and who -b Post 302950347 by Don Cragun on Thursday 23rd of July 2015 03:34:34 PM

07-23-2015

Registered User

Quote:

Originally Posted by RavinderSingh13

Hello seenuvasan1985,

You can always refer man pages for options. Like as follows.

... ... ...

As above quotes, you can take one example who -b tells same like when a person(OS this case) born(came up) and uptime tells how old a person(OS this case, means what time it got rebooted last time) is. Just an silly and simple examples. Hope this helps you.

Thanks,
R. Singh

That doesn't answer the question. On my system, the command line:

Code:

date;uptime;who -b

produced the output:

Code:

Thu Jul 23 12:19:26 PDT 2015
12:19  up 22 days, 12:22, 10 users, load averages: 1.08 1.06 1.09
reboot   ~        Jun 30 23:55

a few minutes ago. That shows a boot time reported by uptime about two minutes later than the time reported by who -b. I can blame that on the times being recorded at different phases in the boot process. I think seenuvasan1985 is asking why the timestamps on his system are ~6 months apart. Why did his system go down and come back up without rebooting?

Maybe someone took the system down to single user mode and then brought it back up to multi-user mode 187 days ago without rebooting???

Don Cragun

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RUPTIME(1)						    BSD General Commands Manual 						RUPTIME(1)

NAME

     ruptime -- show host status of local machines

SYNOPSIS

     ruptime [-alrtu]

DESCRIPTION

     ruptime gives a status line like uptime(1) for each machine on the local network; these are formed from packets broadcast by each host on the
     network via the rwhod(8) daemon.  The default broadcast time by the hosts is every three minutes.

     Machines for which no status report has been received for 11 minutes are shown as being down.

     The options are as follows:

     -a      Users idle an hour or more are not counted unless the -a flag is given.

     -l      Sort by load average.

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     -u      Sort by number of users.

     The default listing is sorted by host name.

FILES

     /var/rwho/whod.*  data files

SEE ALSO

     rup(1), rwho(1), uptime(1), rwhod(8)

HISTORY

     ruptime appeared in 4.2BSD.

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								  August 9, 2005							       BSD

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