I've been struggling with "grep -Po" off and on for a couple hours.
What I would like to do is to find out how many bytes the virtual disk size is as reported by qemu-img info.
Here's example output:
$ qemu-img info 022eb199-954d-4c78-8550-0ea1d31111ec image: 022eb199-954d-4c78-8550-0ea1d31111ec file format: qcow2 virtual size: 40G (42949672960 bytes) disk size: 20G cluster_size: 65536
And here's what I've been trying variations of:
$ qemu-img info 022eb199-954d-4c78-8550-0ea1d31111ec | grep -Po '\(([0-9]+).*\)' (42949672960 bytes)
But I would just like the number. I guess I'm struggling with how to tell "grep -Po" which part of the regex I'd like extracted. I thought the "(" brackets would do that.
Any help would be greatly appreciated. :)