Powershell example 1

Restart-Computers.ps1

# Define input parameters
param (
  [string] $filename = $(throw "Filename is required!")
)

Write-Host "Reading computer names from $filename"

# Read file
$computers = get-content $filename
foreach ($computer in $computers) {

  # Connect to WMI
  $wmi = get-wmiobject -class "Win32_OperatingSystem" `
   -namespace "root/cimv2" -computer $computer

  # Restart computer
  foreach ($item in $wmi) {
    $wmi.reboot()
    write-host "Restarted " + $computer
  }
}

ScopeTest.ps1

write-host "1 (var): $var"

$var = "SCRIPT"
$global:var = "GLOBAL"

write-host "2a (var): $var"
write-host "2b (global): $global:var"

function foo {
  write-host "3a (var): $var"
  write-host "3b (global): $global:var"

  $var = "LOCAL"
  $script:var = "SCRIPT!"

  write-host "4a (var): $var"
  write-host "4b (global): $global:var"
  write-host "4c (script): $script:var"
}

foo

write-host "5a (var): $var"
write-host "5b (global): $global:var"
write-host "5c (script): $script:var"

NegativeMatchingTest.ps1

$var="The-quick-brown-fox-jumped-over-the-lazy-dog."
$var2="The quick brown fox jumped over the lazy dog."
$regex=[regex]"/s{1}"
$var
if (($regex.IsMatch($var)) -eq "False")
{
write-host "Expression has spaces"
}
else
{
write-host "Expression has no spaces" }

$var2
if (($regex.IsMatch($var2)) -eq "False")
{
write-host "Expression has spaces"
}
else
{
write-host "Expression has no spaces" }

ForEachFruit.ps1 #ForEachFruit.ps1 $var=("apple","banana","pineapple","orange") foreach ($fruit in $var) { $i++ #this is a counter that is incremented by one each time through write-host "Adding" $fruit } write-host "Added" $i "pieces of fruit"   ForEachFile.ps1 #ForEachFile.ps1 set-location "C:/" $sum=0 foreach ($file in get-childitem) { #$file.GetType() if (($file.GetType()).Name -eq "FileInfo") { write-host $file.fullname `t $file.length "bytes" $sum=$sum+$file.length $i++ } } write-host "Counted" $i "file for a total of" $sum "bytes." ForEachSvc.ps1 #ForEachSvc.ps1 get-service | foreach { if ($_.status -eq "Running") { write-host $_.displayname "("$_.status")" -foregroundcolor "Green" write-host `t "Service Type="$_.servicetype -foregroundcolor "Green" } else { write-host $_.displayname "("$_.status")" -foregroundcolor "Red" } } IfTest.ps1 #IfTest.ps1 $i=11 if ($i-le 10) { "Less than 10" } else { "Greater than 10" }   IfElseIfTest.ps1 #IfElseIfTest.ps1 $i=45 if ($i -le 10) { write-host "Less than 25" } elseif ($i -le 50) { write-host "Less than 50" } else { write-host "Greater than 50" } IfElseIfTest.ps1 #IfElseIfTest.ps1 $i=45 if ($i -le 10) { write-host "Less than 25" } elseif ($i -le 50) { write-host "Less than 50" } else { write-host "Greater than 50" }