Very Simple Powershell

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
{
    ...
}

switch($x)
{
    condition {...;break}
    default {...}
}

-gt greater than
-lt less than
-eq equal

Circulation

for(;;)
{
    ...
}

foreach($var in $set)
{
    ...
}

while()
{
    ...
}
do
{
    ...
}
while/until()

.NET & Class

Class

#show all members of a object
$var | gm
#call member function
$var.fun()
#visit member variable
$var.var

.NET

some methods to creat a new object

$obj = New-Object System.Version
$obj
$obj = New-Object System.Version 3 6
$obj
$obj = [System.Version]::New()
$obj
$obj = [System.Version]::New(3,6)
$obj

type conversion

$obj.ToString()
[int]1.7
[System.Version]'3.6.0.0'

Create a Class

class MyClass
{
    <hidden|static>
    [typename]$<member>
    MyClass()#Constructor
    {
        ...
    }
}

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