BrowserUk,
Can you explain how it will screw up?

I have subsequently tested it and it works as I expect it to. I did find that on my AIX, the output of the command isn't exactly the same as described by the OP - specifically there are two spaces before hdisk## but after accounting for that, it works as intended. Update: The modifications I made that may make the difference (as I said, it worked as expected) were as follows: 

local $/ = "\n  hdisk";
my ($disk) = $_ =~ /\s+(hdisk\w+)/;

[download]

Cheers - L~R

In reply to Re^3: Parsing output from a command by Limbic~Region
in thread Parsing output from a command by ronix

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