ioreg -l | grep -i capacity | tr '\n' ' | ' | awk '{printf("%.2f%%\n", $10/$5 * 100)}'

I added a \n after the last % in the printf command.

-Mark

ioreg -l | awk '$3~/Capacity/{c[$3]=$5}END{OFMT="%.2f%%";max=c["\"MaxCapacity\""];print(max>0?100*c["\"CurrentCapacity\""]/max:"?")}'

I always get "awk division by zero" on 10.6.
Is your awk-overkill for 10.6? I'd love to cut down on the number of commands and pipes of the original script...

I get that error too.
AMF, none of these scripts work with me (PPC, G4, 10.5.8)

Although it doesn't work on 10.6.2 for me I'd love to understand it. Could anybody detail this awk-monster in plain english, a little?
Pretty please? :-)

This first awk command reads the standard input, one line at a time (if necessary; I'm guessing only one line is being sent to it here), and splits the line into columns, the data in column c having the name $c. (So $5 is the 5th column's data and $10 is the 10th column's). The printf command calculates $10/$5*100 (that is, the 10th column divided by the 5th column, times 100) and prints it as a floating-point number with 2 decimal places ("%.2f") followed by a percentage sign ("%%").

awk '$3~/Capacity/ {c[$3]=$5} END{OFMT="%.2f%%"; max=c["\"MaxCapacity\""]; print(max>0?100*c["\"CurrentCapacity\""]/max:"?")}'

This awk command starts by reading in each line of ioreg -l, one at a time. Whenever column 3 ($3) contains the word "Capacity" ($3~/Capacity), it runs the command "c[$3]=$5", which stores the fifth column into an array (a box) labelled with the contents of the third column. (Unlike in some languages, awk's arrays can be labelled with text, not just numbers.)

The END segment means to run the following command after you're done reading in standard input. First it sets OFMT="%.2f%%", which means to change the output format so that it outputs real numbers with two decimal places followed by a percentage sign (as above). Second, it defines the variable max to be the contents of the array labelled "MaxCapacity" (which was defined in the first part of the process). Next it prints out the result of the formula max>0? 100*c["\"CurrentCapacity\""]/max: "?" which is an if-then statement (with the form test?true:false; awk stole this notation from C). If the variable max is greater than zero, then take the contents of the array labelled "CurrentCapacity", divide it by max, and multiply by 100. If max is not greater than zero, then something wrong happened (maybe ioreg doesn't have a line which says "MaxCapacity") and so return the character "?".

Type "man awk" in the terminal for a full description of the command. It's basically a full-blown programming language, designed to deal with text files one line at a time, and it's really useful; it's also something you can pick up a little bit at a time, if you're so inclined.

[ Reply to This | # ]

I just realized I've never thanked you for explaining the commands.
I've (at the time) just started to work with awk and your detailed breakdown helped a lot in understanding.
People like you make this site to what it is!
So, some months late but from my heart ... THANK YOU!


In the meantime I've not only understood what awk does, but could also adapt it to a different ioreg-syntax, thus speeding up the command by a factor of 15 (thats a speed increase of 1500% - well worth a try).

50 iterations of the original command took a 15.3 secs on a MacBook (not Pro) Unibody.
The same number of iterations with the modified line take only 1.1 sec...:

ioreg -n AppleSmartBattery -r | awk '$1~/Capacity/{c[$1]=$3} END{OFMT="%.2f%%"; max=c["\"MaxCapacity\""]; print (max>0? 100*c["\"CurrentCapacity\""]/max: "?")}'

ioreg -l |awk 'BEGIN{FS="=";max=0;cur=0;}
$1~/CurrentCapacity/{cur=$2} 
$1~/MaxCapacity/{max=$2}
END{if (max>0) {printf "%.2f%%\n",cur/max*100} else {print "?"}}'

Hallo,
how about : pmset -g ps

In Geektool i use :

pmset -g ps | sed -e '$!N;s/\n/ /' -e 's/\;\ AC\ attached\;\ not\ charging//;s/discharging\;//' -e 's/Currenty\ drawing\ from/\ /;s/\ \ -Internal/\ \ \|\ \ /;s/-0./\ :\ \ /;s/\;/\ \ \ \»\ /g' | iconv -f utf-8 -t ucs-2-internal

Bye
Matt

pmset -g ps  |  sed -n 's/.*[[:blank:]]+*\(.*%\).*/\1/p'

Unfortunately pmset spams my system.log with useless messages like
"executing /usr/bin/pmset"

The following command is quicker, more precise, does not make any entries in any log and works for me. It does look a little more complex, though:

ioreg -n AppleSmartBattery -r | awk '$1~/Capacity/{c[$1]=$3} END{OFMT="%.2f%%"; max=c["\"MaxCapacity\""]; print (max>0? 100*c["\"CurrentCapacity\""]/max: "?")}'