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Top Forums Shell Programming and Scripting awk or sed to determine battery percentage Post 302391498 by tlarkin on Monday 1st of February 2010 01:50:36 PM
Old 02-01-2010
awk or sed to determine battery percentage

So, I know this can be done but my awk and sed wizardry is not up to snuff for the job. Basically, I have tons and tons of Macbooks at my work and I am trying to grab the current percentage of the battery power on each client.

If I use the system_profiler SPPowerDataType command it prints off the current specs of all power management. One spec is the current charge of the battery in mAh, and one is the total capacity.

So, I would like to grep | awk | or sed out this info and then have it do simple division then convert the answer into readable percentage.

So like if I pull out the string of the current charge and it is at 1020 mAh, and I know that the total capacity of the battery is 5242 mAh. I could grab both of those strings but how to I make those form a number in percentage that is human readable?

Thanks a ton for any help in advance.

EDIT

Guess I should give some example code...

Code:
system_profiler SPPowerDataType | grep "Charging status" | awk '{ print 4}'

This returns the numerical number of how much charge, and I would need to grab the total capacity and the divide them or whatever to output a percentage.

Last edited by tlarkin; 02-01-2010 at 03:38 PM..
 

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XAPM(1) 																   XAPM(1)

NAME
xapm - display Advanced Power Management (APM) BIOS information SYNOPSIS
xapm [ ... ] DESCRIPTION
xapm puts up an X window that displays the remaining battery life. The left side of the window contains a printed time or percentage; the right side of the window contains a bar indicating the percentage. Clicking on the left side of the window will toggle the display between time and percentage. OPTIONS AND RESOURCES
In addition to standard Xt options, the following options are available: -V Print the program version number and exit. -highcolor color The color of the bar when the battery percentage is above highvalue. Defaults to "green". (*highColor) -lowcolor color The color of the bar when the battery percentage is between lowvalue and highvalue. Defaults to "yellow". (*lowColor) -criticalcolor color The color of the bar when the battery percentage is below lowvalue. Defaults to "red". This color is also used to flash the alphanumeric part of the display when the power status is critical. (*criticalCOlor) -highvalue highvalue Set highvalue. The default is 50. (*highValue) -lowvalue lowvalue Set lowvalue. The default is 10. (*lowValue) -chargingcolor color The color of the printed display when charging. The default is "blue". Use -foreground to change the color used when on battery power. (*chargingColor) -delay delay Sets the number of seconds delay between each update. The default is 1. (*delay) -percent Display percentage on startup, instead of time remaining. (*percent, boolean) -percentauto Swap automatically between displaying percentage and displaying the time remaining. When on ac power, display percentage, when on battery power, display the time remaining. BUGS
There is no way to inhibit the alphanumeric display or the bar display. When the battery percentage is low, using a bright color to warn you of impending doom may be futile because the bar is too short. Because of the form widget's desire to maintain proportions, dynamic resizing of the window may not do what you want it to do. FILES
/proc/apm AUTHOR
This program was written by Rik Faith (faith@cs.unc.edu) and may be freely distributed under the terms of the GNU General Public License. There is ABSOLUTELY NO WARRANTY for this program. The current maintainer is Avery Pennarun (apenwarr@worldvisions.ca). SEE ALSO
apm(1), apmd(8). January 2004 XAPM(1)
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