Super User is a question and answer site for computer enthusiasts and power users. Join them; it only takes a minute:

Sign up
Here's how it works:
  1. Anybody can ask a question
  2. Anybody can answer
  3. The best answers are voted up and rise to the top

I have Linux desktop. I don't leave it 24/7 turned on. I would like to gather statistics on how much time computer was turned on each day, f.e.:

2012-08-21: 7:52
2012-08-22: 8:43
2012-08-23: 7:36

If computer wasn't turned on, no record is required.

share|improve this question

You can create a script which runs uptime & dumps it into a file.

uptime >> uptime.log

After that setup a cron job for it. To know more about how to create a cron job : Create Cron Job

Or you can sign-up for an online service to do it for you : Uptime Project

share|improve this answer
yup, I was thinking about this, maybe even get init.d script to run in shutdown. – aisbaa Aug 23 '12 at 12:14
that's also an option.. so i guess i've answered what you actually needed.. – aliasgar Aug 23 '12 at 12:30
this is really good answer, but I'm looking for more sophisticated solution. Maybe something like workrave, which has this as additional functionality, except I don't need this typing break solution. – aisbaa Aug 23 '12 at 15:01

This logs the output of 'uptime' every five minutes. This output also includes the number of users currently logged on and load averages of your computer the last 1, 5 and 15 minutes:

sudo bash #root
mkdir /var/log/uptime
crontab -e

Add this line:

*/5  * * * * echo `date +\%Y\%m\%d;uptime` >> /var/log/uptime/uptime.log 2>&1

And to split+gzip the log into weekly files:

cat <<'EOF'. > /etc/logrotate.d/uptime
/var/log/uptime/uptime.log {
    rotate 99999

Then, after some time has passed, view your uptime for each day like this:

uplog() { (cd /var/log/uptime/;zcat uptime.log*gz;cat uptime.log) }
uplog|cut -c1-8|uniq -c|perl -aple'$_.=" ".("=" x ($F[0]/5))'

The number 288 (12*24) means the computer was up all day (although reboots shorter than five minutes may go undetected by this method).

Or similarly for each month like this:

uplog|cut -c1-6|uniq -c|perl -aple'$_.=" ".("=" x ($F[0]/150))'
share|improve this answer
Hi Kjethil, please go urgently to Help Center > Contact and use "I need to merge user profiles" – bummi Jan 13 at 11:09

There will be datestamped entries in syslog (/var/log/messages*) you can extract this information from.

You could also add K entries to /etc/rc0.d to, for example, to run logger to add a specific syslog record on shutdown. See or equivalent for the Linux distribution you are using

$ vim /etc/init.d/uptime
$ cat /etc/init.d/uptime

# chkconfig: 0 99 1
# description: Record uptime at shutdown.

start() {
        uptime >> /var/log/uptime 2>&1

case "$1" in
        echo Usage: $0 start

$ chmod +x /etc/init.d/uptime

$ chkconfig --add uptime

$ chkconfig --list uptime
uptime          0:on    1:off   2:off   3:off   4:off   5:off   6:off

$ ls /etc/rc*d/*uptime*
/etc/rc0.d/S99uptime  /etc/rc3.d/K01uptime  /etc/rc6.d/K01uptime
/etc/rc1.d/K01uptime  /etc/rc4.d/K01uptime
/etc/rc2.d/K01uptime  /etc/rc5.d/K01uptime

$ /etc/rc0.d/S99uptime start

$ cat /var/log/uptime
 13:15:28 up 135 days, 12:06,  1 user,  load average: 0.07, 0.04, 0.01
share|improve this answer

according to last manual page:

The pseudo user reboot logs in each time the system is rebooted. Thus last reboot will show a log of all reboots since the log file was created.

so last column of #last reboot command gives you uptime history:

#last reboot
reboot   system boot  **************** Sat Sep 21 03:31 - 08:27 (1+04:56)   
reboot   system boot  **************** Wed Aug  7 07:08 - 08:27 (46+01:19)
share|improve this answer
up vote 0 down vote accepted

I've found similar question on stackoverflow . Best uptimed seems to be what I want, thank you guys for help.

share|improve this answer

Tuptime can do it when executing "tuptime -e", for example:

# tuptime -e
Startup:  1  at  08:55:01 AM 08/04/2015
Uptime:   24 seconds
Shutdown: OK  at  08:55:25 AM 08/04/2015

Downtime: 5 seconds

Startup:  2  at  08:55:31 AM 08/04/2015
Uptime:   20 seconds
Shutdown: OK  at  08:55:51 AM 08/04/2015

Depending on your locales, the date format can change.


share|improve this answer

You must log in to answer this question.

Not the answer you're looking for? Browse other questions tagged .