9. PowerShell-Conditional control and logical judgment

• PowerShell Condition Control

1. If, Else, ElseIf statement

   Basic syntax:

   if ( condition )

   { Code }

   ElseIf ( condition )

   { Code }

   Else ( conditional )

   { Code }

   Else

   { Code }

   For example 1:

   $n =10

   if ($n-eq 1)

   {"N=1"}

   ElseIf ($n-ne 1)

   {"N!=1,and n= $n"}

   Results: {"N!=1,and n= $n"}

   Example 2: View the operating system of this computer

   $ComputerName = (Get-wmiobject-class win32_computersystem). Name

   $OS _version = (Get-wmiobject-class win32_operatingsystem-computer$computername). Version

   if (($OS _version-eq "5.1.2600")-or ($OS _version-eq "5.2.3790"))

   {

   Write-host "ComputerName:" $ComputerName

   if ($OS _version-eq "5.1.2600")

   {

   Write-host "Os:windowsxp"

   }

   ElseIf ($OS _version-eq "5.2.3790")

   {

   Write-host "os:windows2003"

   }

   }

   ElseIf (($OS _version-eq "5.0.2195")-or ($OS _version-eq "6.1.7600"))

   {

   Write-host "ComputerName:" $ComputerName

   if ($OS _version-eq "5.0.2195")

   {

   Write-host "os:windows2000 Server"

   }

   ElseIf ($OS _version-eq "6.1.7600")

   {

   Write-host "Os:windows7"

   }

   }

   Else

   {

   Write-host "$ComputerNameis not supported."

   }

   "–end of report–"

   Results:

   Computer1 is not supported.

   -end of report-

   PS c:\>

   PS c:\> $OS _version

   6.3.9600

2. Switch Statement

   Basic syntax:

   Switch ( expression )

   {

   ( expression ) { Code }

   value { code }

   Default { execution code }

   }

   For example , we can query the value of "DomainRole" to determine the role that the computer holds in the current activedirectory domain, try the following code:

   Switch ((Get-wmiobject-class win32_computersystem). DomainRole)

   {

   0 {write-host "standaloneworkstation"}

   1 {write-host "Memberworkstation"}

   2 {write-host "Standaloneserver"}

   3 {write-host "Memberserver"}

   4 {write-host "Backup DomainController"}

   5 {write-host "Primarydomain Controller"}

   Default {write-host "Cannotdetermine domain Role"}

   }

Run the result on the member computer:"Member workstation"

• PowerShell Logical Judgment

2. introduction

   - EQ determine if the equals (equal)

   -lt than

   -gt determine if greater than ( Greater than)

   -ge Determine if it is greater than or equal to (greater of Equal)

   -le Determine if it is less than or equal to (lesser or equal)

   P style= "Color:rgb (0,0,0);" >-ne (no equal)

   -ieq ( case-insensitive)

   -ceq ( case-sensitive)

    

4. instance

   " A "–eq" a " result : true

   : true

   result : False

6. Logical operations

   -and and

   -or or

   -not Non-

   ! Non-

Reference: http://marui.blog.51cto.com/1034148/293907

This article comes from the "Ricky's blog" blog, please be sure to keep this source http://57388.blog.51cto.com/47388/1639194

9. PowerShell-Conditional control and logical judgment