June 2013 – The Tech Depot

Say you’d like to copy an exuberant amount of data from one server to another and you’re unsure if the target disk has sufficient space

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. Perhaps you’d simply like to know how much space you’ve got. There are several way to check this, but here’s one more, and in my opinion the fastest:

(Get-WmiObject win32_logicaldisk -ComputerName 'youservernamehere' | where {$_.deviceid -eq 'C:'} | ft freespace -HideTableHeaders | Out-String).trim() / 1GB

1	(Get-WmiObject win32_logicaldisk -ComputerName 'youservernamehere' \| where {$_.deviceid -eq 'C:'} \| ft freespace -HideTableHeaders \| Out-String).trim() / 1GB

Run this one-liner from any computer, and as long as you run it a user context where you have user rights on the server, you will get the amount of free space in GB

You can also use this a basis for a script listing out renaming space on several computers or several disks on a single server, but that might be the subject for another article!

I head a real brain teaser when working a script earlier today. Basically I was modifying a script which lists out unused phone numbers in a range. It turns out German phone numbers (and any number greater than 2147483647) are incompatible with number ranges

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. Here’s why, and how to solve it.

When using number ranges, you are limited to signed 32 bit integers (-2147483646 to +2147483647). This is rarely an issue, but when working with untypical numbers, like unformatted phone numbers or the byte value of very large files, it can pose a problem.

This is an example of a range that will work:

10..20

10..20

This however, won’t work:

2147483640..2147483648

1	2147483640..2147483648

The high number is above the max value for a signed 32 bit integer.

Solving required a bit of a hack. To work around this limitation, use a While loop to create an array with the number series you’d like to feed into to your variable. Below is an example:

$counter = $NumberStart
while ($counter -lt $NumberEnd) {    
    $counter++
    [ARRAY]$Array += $temp
    }

$counter = $NumberStart

while ($counter -lt $NumberEnd) {

$counter++

[ARRAY]$Array += $temp

}

$Counter is initially set to be the starting number of your range. It will be the control parameter that the While loop uses to check if it’s done working
.
$NumberStart is the starting (low) number in you range.
$NumberEnd is the end (high) number in you range
$Array is your range (or it’s equivalent). It gets fed each value from $NumberStart to $NumberEnd. This array will hold 64 bit integers.

Month: June 2013

Techtip: One-liner to get free space

Working around number ranges limited to 32 bit integers