Microsoft Windows Server 2008 Administration

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Steve Seguis

"Microsoft Windows Server 2008 Administration"

The For statement, otherwise known as a For loop, runs a block of code until a condition
is found to be true. Normally, you would use a For loop when you want to initialize
a variable, run it while the condition is true, and then run some code that is repeated
for each execution. FOR loops have the following syntax:
For(;;) {


}
The following code snippet is a For loop that counts from 1 to 100:
For($i=1;$i -lt 101;$i++) {
write-host $i
}
The  section is executed only once for the For loop and is used for initialization.
In this example, I used this section to initialize $i to the value of 1. The 
section defines what condition must be true before the code in the code block gets executed.
In this example, I state that if $i is less than 101, it can execute the code. The  section
is code that is executed each time the loop executes. In this case, I increment $i by 1 by
using the shorthand notation of $i++, which is functionally equivalent to $i = $i + 1. Finally,
for each iteration of the loop, I output the value of $i. This effectively makes the script count
from 1 to 100 since once $i is incremented to the value of 101, the condition that $i is less
than 101 is no longer true and the loop stops executing.
NOTE If you have a programming background or have used C, C++, or Java, the ++ operator
should be nothing new to you.
                



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Steve Seguis

"Microsoft Windows Server 2008 Administration"