Parse hdiutil -plist data for specific info

Shell Programming and Scripting
1

I am trying to get the mounted size of a compressed .dmg. I can use hdiutil imageinfo -plist $imagename to get a lot of info, including what I need. The problem is that I have no idea how to parse that single piece of info into a variable (or in this case, array element). Here is what I have so far

#!/bin/bash
#first part of script which generates the array below
for i in ${DMGLIST[@]} #This array contains a list of .dmg files
	do
	hdiutil imageinfo -plist $i | #some way to parse stdout for the info and save it to a variable
	done

The info I need is in the middle of the output

	<key>Total Bytes</key>
		<integer>73400320</integer>

And I have no idea how to go about parsing through it since the string is broken up by the </key> and <integer> things. I can think of some complex, inelegant ways, but I'm sure someone here has an idea for how to do it better! Thanks!

2

Try this (Array DMGSIZE will contain size of each .dmg file in DMGLIST):

#!/bin/bash
#first part of script which generates the array below
pos=0
for i in ${DMGLIST[@]} #This array contains a list of .dmg files
do
    DMGSIZE[pos++]=$(hdiutil imageinfo -plist $1 | awk -F"[<>]" 'a{print $3; exit}$2=="key"&&$3=="Total Bytes"{a=1}')
done

Though it may be better to generate DMGSIZE at the same time you are generating DMGLIST, ie in the bit of the script not shown.

1 Like
3

Perfect. I had to change the 1 to i, but everything else works exactly. Now to look up how this works for future reference. Thanks!