How to find the uptime since last wake from standby

Question

I want to know the uptime since the last wake from standby.

The command uptime only shows the difference between current time minus the last startup time.

score 36 · Answer 1 · answered Nov 17 '19 at 19:24

None of these answers worked for me. But I usefully found sleep.target which is made for exactly this:

$ journalctl -n4 -u sleep.target
nov. 17 17:16:37 kaa systemd[1]: Reached target Sleep.
nov. 17 18:46:22 kaa systemd[1]: Stopped target Sleep.
nov. 17 19:27:31 kaa systemd[1]: Reached target Sleep.
nov. 17 19:45:21 kaa systemd[1]: Stopped target Sleep.

score 31 · Answer 2 · edited Nov 22 '14 at 00:49

In /var/log/pm-suspend.log, look for the last line looking like this one:

Sun Dec 16 09:30:31 CET 2012: Awake.

That's your last wakeup time. You can calculate your uptime since then the way Paul suggested.

Periodically your logrotate will "rotate" logs to prevent them from growing too big, so you may find an empty pm-suspend.log file. In this case, just look for the pm-suspend.log.1 file (you may find also other log files named like pm-suspend.log.2.gz and so on; you can examine them using zcat or zless).

score 29 · Answer 3 · edited Feb 16 '24 at 08:46

The pm-suspend program is not the only option how to suspend the computer. My log of this program is now empty, but I have found more reliable command:

cat /var/log/syslog | grep 'systemd-sleep'

You can then filter by messages like resumed or Suspending, by adding another grep.

And the output is:

Oct  2 09:11:48 dmatej-lenovo systemd-sleep[931]: Suspending system...
Oct  2 09:53:10 dmatej-lenovo systemd-sleep[931]: System resumed.
Oct  2 15:02:48 dmatej-lenovo systemd-sleep[27516]: Suspending system...
Oct  2 16:07:19 dmatej-lenovo systemd-sleep[27516]: System resumed.
Oct  2 16:32:48 dmatej-lenovo systemd-sleep[29622]: Suspending system...
Oct  2 17:16:41 dmatej-lenovo systemd-sleep[29622]: System resumed.
Oct  3 00:24:58 dmatej-lenovo systemd-sleep[21316]: Suspending system...
Oct  3 08:17:22 dmatej-lenovo systemd-sleep[21316]: System resumed.
Oct  3 09:09:25 dmatej-lenovo systemd-sleep[24739]: Suspending system...
Oct  3 09:50:47 dmatej-lenovo systemd-sleep[24739]: System resumed.

On newer versions of Ubuntu, this may instead look like:

Feb 14 16:42:03 ThinkPad-P15v-Gen-1 systemd-sleep[30594]: Entering sleep state 'suspend'...
Feb 14 18:37:55 ThinkPad-P15v-Gen-1 systemd-sleep[30594]: System returned from sleep state.
Feb 15 17:14:06 ThinkPad-P15v-Gen-1 systemd-sleep[3441]: Entering sleep state 'suspend'...
Feb 16 09:36:36 ThinkPad-P15v-Gen-1 systemd-sleep[3441]: System returned from sleep state.

score 24 · Answer 4 · answered Jan 23 '16 at 20:39

For desktops/servers running systemd, while there is no direct command that will tell the info directly (as far as I am aware), all the data is captured in the journal.

You can grep the journal, for example:

echo ">> [SUSPEND] Times during current boot"
journalctl -b 0 |grep "]: Suspending system..."
echo ">> [WAKE] Times during current boot"
journalctl -b 0 |grep "PM: Finishing wakeup"

Or, for fancy output, I wrote a python3 script (runs fine on Fedora 23) Sample output:

Initial Boot Timestamp:  2016-01-15 09:31:32 

     Wake Timestamp     |    Suspend Timestamp   |       Awake Time       |
  --------------------  |  --------------------  |  --------------------  |
   2016-01-15 09:31:32  |   2016-01-15 09:36:03  |          0h  4m        |
   2016-01-15 09:36:22  |   2016-01-15 19:15:04  |          9h 38m        |
   2016-01-15 19:22:21  |   2016-01-15 20:00:05  |          0h 37m        |
   ...
   -------------------  |  --------------------  |  --------------------  | 

Summary: Days Since Boot [8.23] | Days Awake [4.14] | Suspend/Wake Cycles: [28]

The script is in github. link to github repo

score 2 · Answer 5 · answered Apr 23 '15 at 15:30

2

I did not have pm-suspend.log on my machine.

This worked for me:

/usr/bin/pmset -g log | grep Wake | grep "due to" | tail -n1

Also says what woke the computer up. :-)

answered Apr 23 '15 at 15:30

Mike

21

Jacek Pietal · Answer 6 · 2014-06-27T08:12:44.157

1

modified better verision of steps answer

grep ': Awake' /var/log/pm-suspend.log

edit haha thanks for the comments :D

edited Jun 27 '14 at 08:12

answered Jun 26 '14 at 15:58

Jacek Pietal

111

score 0 · Answer 7 · answered Mar 12 '16 at 14:19

0

You can use tuptime for track the system startup/shutdown life.

answered Mar 12 '16 at 14:19

rfmoz

421

score 0 · Answer 8 · answered Jun 06 '18 at 16:26

0

I think this is a very solid way to do it:

systemd[1]: Started Run anacron jobs at resume

Search for when the OS starts anacron, will happen however the machine is turned on

answered Jun 06 '18 at 16:26

Jay Day Zee

101

score 0 · Answer 9 · answered Mar 01 '20 at 09:06

If you want to know the last wake up time on Ubuntu 19.04 you can also:

grep sleep /var/log/auth.log*

auth.log.1:Feb 29 17:49:12 systemd-logind[694]: Operation 'sleep' finished.
auth.log.1:Mar  1 09:39:01 systemd-logind[694]: Operation 'sleep' finished.

I add this answer because I don't have the pm-suspend file like other answers suggested using.

score 0 · Answer 10 · answered Aug 30 '22 at 18:07

Answer:

journalctl -r -S "1 day ago" | grep "System returned from sleep state" | head -1 | awk '{print $1, $2, $3}' | {read last_wake_up; echo $(($(date --date="now" +%s) - $(date --date="$last_wake_up" +%s)))} | {read sec ; eval "echo $(date -ud "@$sec" +'$((%s/3600/24)) days %H hours %M minutes %S seconds')"}

result:

0 days 07 hours 37 minutes 07 seconds

A bit shorter answer:

journalctl -r -S "1 day ago" | grep "System returned from sleep state" | head -1 | awk '{print $1, $2, $3}' | {read last_wake_up; echo $(( ($(date --date="now" +%s) - $(date --date="$last_wake_up" +%s) )/(60*60) ))"h"}

result:

6h

(tested on Ubuntu 22.04.1 LTS, kernel 5.15).

If you want to see minutes, change (60*60)))"h" to (60)))"m".

If you want to see days, change (60*60)))"h" to (60*60*24)))"d".

If you want to only see last wake up log, use:

journalctl -r -S "1 day ago" | grep "System returned from sleep state" | head -1

Please keep in mind that it's nice to have defined "since" -S in journalctl command, because there are a lot of logs there. On my machine I have 3 905 300 lines, and for the last day it's only 14 733.

"Since" can also be defined as a -S "2022-08-29 12:20".

score 0 · Answer 11 · answered Jan 03 '23 at 20:28

I used the kernel log to get the wakeup time.

wakeup=$(grep 'PM: suspend exit' /var/log/kern.log | tail -n1 | cut -c -15)
awake=$(( $(date +%s) - $(date --date "$wakeup" +%s) ))

This log ought to be pretty small and easy to search.

All the other answers either didn't work on my system (Ubuntu 22.04 LTS) or required installing something else.

score 0 · Answer 12 · answered Nov 15 '11 at 02:29

What are you using to initiate the standby?

If you can use a script, then after the line

echo -n "standby" > /proc/acpi/sleep

you could have the line

echo `date +%s` >> /var/log/wakeups.log

Or something similar. This would mean that the first thing the machine did when it woke up was to write the current time and date to a log file (n seconds since epoch).

Then tail -1 /var/log/wakeups.log would give you the last time. You could could subtract this from the current time to get seconds since the last wakeup.

score 0 · Answer 13 · answered May 30 '12 at 09:25

0

Search for the last occurence of the string "PM: restore of devices complete" in /var/log/messages. If your machine has been up too long, then the log may be rotated, though.

answered May 30 '12 at 09:25

teika kazura

710

score 0 · Answer 14 · edited May 03 '16 at 16:37

0

Extending Steps answer:

grep Awake /var/log/pm-suspend.log | tail -1

This will get the line with the last wakeup time.

edited May 03 '16 at 16:37

Alexander Hanysz

103
3

answered Jan 19 '15 at 05:02

thethakuri

103

score -1 · Answer 15 · answered Jul 26 '17 at 16:58

-1

on fedora using ripgrep

rg Suspend /var/log/messages

result:

34338:Jul 26 03:03:46 <hostname> systemd-sleep: Suspending system...

answered Jul 26 '17 at 16:58

illucent

31

How to find the uptime since last wake from standby

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