sleep-wake-time-diff

These are a couple of bash scripts to log sleep/wake times then do a diff to hours on

Note - This is for Linux

Three Files:

• sleep-wake-log-time.sh
• math-bash.sh
• sleep.sh - this one is new, also logs time when you put computer into suspend

/lib/systemd/system-sleep

This is where the sleep-wake-log-time.sh file goes.

When you close/open your laptop lid, the sleep-wake-log-time.sh detects which one happened and writes a sleep/wake label just before a timestamp.

Then math-bash.sh parses the 1timelogs.txt text file that was written to.

Note: this code is pretty ugly I can barely write bash, mostly found this code online.

timelogs.txt is written to ~/scripts/bash

time diff

math-bash.sh parses the lines and then is able to work backwards from a sleep to wake event and does a subtraction to find the difference in seconds from the timestamps. Then this s converted to hours by dividing the difference by 3600.

I wrote this because I wanted to find out how long this Chromebook that I loaded GalliumOs would last for with tlp and cpufrequtils enabled though I had to set the latter to performance as I could barely use Chrome. I also have a couple of Debian VM's on this Chromebook(Toshiba Chromebook 2 2014, with a Celeron cpu).

Powerstat says it averages 4 watts on use and the battery has a design capacity of 44Wh or so... mine's at 37.37Wh

Anyway so timelogs.txt will have entries like this:

sleep

1529495388

wake

1529542905

sleep

1529543952

wake

1529544587

sleep

1529548326

wake

1529548330

sleep

1529552631

wake

1529552684

sleep

1529552760

wake

1529552784

And math-bash.sh will go through that and add it up so you get an output of something like:

1047

1047

3739

4786

4301

9087

2.52 hrs

When running

$bash math-bash.sh

Update 07/06/2018

Added sleep.sh which is a bash script that you run to put your linux computer runnning i3-wm into suspend with i3lock.

You need to add your username to sudoers using visudo, check out this link

The reason for that is you normally have to run pm-suspend as sudo. If you run sudo i3lock you won't be able to log back in(from what I've experienced)

I put this file in my home directory which you get to by cd ~ so if you're in that directory you just call:

$bash sleep.sh

And your computer will lock the screen and go into suspend using pm-suspend

Update 07/07/2018

So it turns out my sleep/wake logs were not working correctly after that $sudo pm-suspend approach.

I looked up some threads, this one is what worked out for me. I put the suspend-wake bash script inside /etc/pm/sleep.d/ and it works.

The pm-suspend route definitely seems to save battery over time. Currently running this on Toshiba Chromebook 2, 2014 Celeron model on GalliumOS with i3-wm.