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Saturday, September 02, 2006

 


PowerShell : How can I tell whitch numbers are missing from a sequence of numbers found in a text file ?



 Another Hey Scripting Guy ! Question I could not refuse ;-)

How Can I Tell Which Numbers Are Missing From a Sequence of Numbers Found in a Text File? In Powershell ?

let’s make a text file containing the following sequence of numbers:

 

# Make a TextFile with the Numbers

@'
2
4
8
9
10
'@ | sc test.txt

 

How are we going to determine which numbers (1, 3, 5, 6, and 7) are missing from the sequence? Like this:

gc test.txt |% {$i = 1}{while ($i -lt $_){$i;$i++};$i++}

 

PoSH>gc test.txt |% {$i = 1}{while ($i -lt $_){$i;$i++};$i++}
1
3
5
6
7

What’s that? Explain how this script works? Come on, SG; didn’t we mention that it was Saturday?

*Edit* did I hear someone say Sort ? (thx Karl)

*Edit2* Added from file with cast to INTEGER

gc test.txt | sort {[int]$_} |% {$i = 1}{while ($i -lt $_){$i;$i++};$i++}

PoSH>2,9,4,8,10 | sort |% {$i = 1}{while ($i -lt $_){$i;$i++};$i++}
1
3
5
6
7

 

*Edit3*, Ok, still no explanation but this might help understanding how this script works :  PowerShell : Can you do that less cryptic ?

Enjoy,

Greetings, /\/\o\/\/
Tags : Monad msh PowerShell




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