#眉標=PowerShell
#副標=PowerShell = Shell + Script + .NET（7）
#大標=函式與劇本
#作者=文／蔡學鏞
#引言=



==<反灰>===========
PS > function hello
>> {
>> $ofs=","
>> "Hello there $args and how are you?"
>> }
>>
PS > hello Bob Carol Ted Alice
Hello there Bob,Carol,Ted,Alice and how are you?
==<end>==============



 
==<反灰>===========
PS > function Add-Two { $args[0] + $args[1] }
PS > add-two 2 3
5
==<end>==============




==<反灰>===========
PS > function Add-Two {
>> $x,$y=$args
>> $x+$y
>> }
>>
PS > add-two 1 2
3
==<end>==============




==<反灰>===========
function subtract ($from, $count) { $from - $count }
==<end>==============




==<反灰>===========
PS > subtract 5 3
2
==<end>==============




==<反灰>===========
PS > subtract -from 5 -count 2
3
PS > subtract -from 4 -count 7
3
==<end>==============




==<反灰>===========
subtract(1,2)
==<end>==============




==<反灰>===========
PS > function nadd ([int] $x, [int] $y) {$x + $y}
==<end>==============




==<反灰>===========
PS > nadd 1 2
3
PS > nadd "1" "2"
3
==<end>==============




==<反灰>===========
PS > function a ($x, $y) {
>> "x is $x"
>> "y is $y"
>> "args is $args"
>> }
>>
PS > a 1
x is 1
y is
args is
PS > a 1 2 3 4 5
x is 1
y is 2
args is 3 4 5
==<end>==============




==<反灰>===========
PS > function add ($x=1, $y=2) { $x + $y }
==<end>==============




==<反灰>===========
PS > add
3
PS > add 5
7
==<end>==============




==<反灰>===========
PS > function dow ([datetime] $d = $(get-date))
>> {
>> $d.dayofweek
>> }
>>
==<end>==============




==<反灰>===========
PS > dow
Tuesday
PS > dow "mar 11, 2008"
Tuesday
==<end>==============



==<反灰>===========
PS > function numbers { 2+2; 9/3; [math]::sqrt(27) }
PS > $result = numbers
PS > $result.length
3
PS > $result[0]
4
PS > $result[1]
3
PS > $result[2]
5.19615242270663
==<end>==============




==<反灰>===========
PS > function numbers
>> {
>> $i=1
>> while ($i -le 10)
>> {
>> $i
>> $i++
>> }
>> }
>>
PS > $result = numbers
==<end>==============




==<反灰>===========
return 2
==<end>==============




==<反灰>===========
PS > dir function:/mkdir
CommandType     Name        Definition
-----------     ----        ----------
Function        mkdir       param([string[]]$pat...
==<end>==============




==<反灰>===========
PS > dir function:/mk*
CommandType     Name        Definition
-----------     ----        ----------
Function        mkdir       param([string[]]$pat...
==<end>==============




==<反灰>===========
PS > (dir function:/).count
78
==<end>==============




==<反灰>===========
PS > function clippy { "I see you're writing a function." }
==<end>==============




==<反灰>===========
PS > (dir function:/).count
79
==<end>==============




==<反灰>===========
PS > dir function:clippy
CommandType     Name        Definition
-----------     ----        ----------
Function        clippy      "I see you're writin...
==<end>==============




==<反灰>===========
PS > rm function:/clippy
==<end>==============




==<反灰>===========
"Hello world"
==<end>==============




==<反灰>===========
PS > ./hello.ps1
Hello world
==<end>==============




==<反灰>===========
PS > Set-ExecutionPolicy remotesigned
PS > ./hello.ps1
Hello world
==<end>==============




==<反灰>===========
"Hello $args"
==<end>==============




==<反灰>===========
PS > ./hello Jerry
Hello Jerry
==<end>==============




==<反灰>===========
param($name="world")
"Hello $name!"
==<end>==============




==<反灰>===========
PS > ./hello
Hello world!
PS > ./hello Jerry
Hello Jerry!
PS >
==<end>==============




==<反灰>===========
function callExit { "calling exit from callExit"; exit}
CallExit
"Done my-script"
==<end>==============




==<反灰>===========
PS > ./my-script.ps1
calling exit from CallExit
==<end>==============




==<反灰>===========
C:\>powershell "'Hi there'; exit 17"
Hi there
==<end>==============




==<反灰>===========
C:\>echo %ERRORLEVEL%
17
==<end>==============