Basic Powershell

Variable

$<name>=<value>

$usrname='John'
$len=32

$null -> null value

$true -> boolean true

$false -> boolean false

$_ -> the variable currently being processed

Data Structure

Array

$var=@(<element>,<element>,...)
$var[0]
$var[100]=2333

Hash Table

$var=@{<key>=<value>,...}
$var[<key>]
$var.key

Process Control

Branch

if()
{
    ...
}
elseif()
{
    ...
}
else …