Powershell

1.Variable declaration

所有的变量都必须以$开始

Example:

[int]$valA = 2;
[int]$valB = 3;
[int]$valC = 0;
$valC = $valA + $valB;
write-host("The sum is: " + $valC);

2.Arrays 

Example:

$myArray = 1,2,3,4,5,6,7,8,9,10;
[int] $sum = 0; 
foreach ($val in $myArray)
{
    write-host ("Index with value:$val");
    $sum = $sum + $val;
}
Write-host(“The sum is: $sum”);

3.Associative Arrays 类似于C++ map, key,value pair.

## Declaration syntax:
# $<arrayname> = @{<keyName = Value>;…}
$countries = @{'88' = 'Bangladesh'; '44' = 'United Kingdom'; '11' = 'United States'; '1' = 'Canada'};
$countries

4.Loops, 支持for, foreach, while三种循环

for ($i=0; $i<10;$i++)
{Write-Host $i} 
$i = 1
for(;;)
{
   Write-Host $i
}

$letterArray = "a","b","c","d"
foreach ($letter in $letterArray)
{
Write-Host $letter
}

while($val -ne 3)
{
   $val++
   Write-Host $val
}

各种操作符:

逻辑操作符， 与 或 非

Operator	Description	Example	Results
-and	logical and	(A -eq A) -and (A -eq B)	false
-or	logical or	(A -eq B) -or (A -eq A)	true
-not	logical not	(1 -eq 1) -and -not (2 -gt 2)	true
!	logical not	(1 -eq 1) -and !(2 -gt 2)	true

比较操作符：

-eq	Equal (case insensitive)
-ne	Not equal (case insensitive)
-ge	Greater than or equal (case insensitive)
-gt	Greater than (case insensitive)
-lt	Less than (case insensitive)
-le	Less than or equal (case insensitive)
-like	Wildcard comparison (case insensitive)
-notlike	Wildcard comparison (case insensitive)
-match	Regular expression comparison (case insensitive)
-notmatch	Regular expression comparison (case insensitive)
-replace	Replace operator (case insensitive)
-contains	Containment operator (case insensitive)
-notcontains	Containment operator (case insensitive)

-ieq	Case insensitive equal
-ine	Case insensitive not equal
-ige	Case insensitive greater than or equal
-igt	Case insensitive greater than
-ile	Case insensitive less than or equal
-ilt	Case insensitive less than
-ilike	Case insensitive equal
-inotlike	Case insensitive equal
-imatch	Case insensitive regular expression comparison
-inotmatch	Case insensitive regular expression comparison
-ireplace	Case insensitive replace operator
-icontains	Case insensitive containment operator
-inotcontains	Case insensitive containment operator

-ceq	Equal (case sensitive)
-cne	Not equal (case sensitive)
-cge	Greater than or equal (case sensitive)
-cgt	Greater than (case sensitive)
-clt	Less than (case sensitive)
-cle	Less than or equal (case sensitive)
-clike	Wildcard comparison (case sensitive)
-cnotlike	Wildcard comparison (case sensitive)
-cmatch	Regular expression comparison (case sensitive)
-cnotmatch	Regular expression comparison (case sensitive)
-creplace	Replace operator (case sensitive)
-ccontains	Containment operator (case sensitive)
-cnotcontains	Containment operator (case sensitive)

-is	Is of a type
-isnot	Is not of a type
-as	Is a type, no error if conversion fails

if (($val1 -eq $val2) -and ! ($val1 = "Some value")){ 
   Write-Host("One condition satisfied.");
}else{
   Write-Host("Condition not satisfied.");
} 

Function: