diff options
| -rw-r--r-- | powershell.html.markdown | 70 |
1 files changed, 54 insertions, 16 deletions
diff --git a/powershell.html.markdown b/powershell.html.markdown index f2f2be61..99f5de97 100644 --- a/powershell.html.markdown +++ b/powershell.html.markdown @@ -41,6 +41,26 @@ Powershell as a Language: 10 * 2 # => 20 35 / 5 # => 7.0 +# Single line comments start with a number symbol. + +<# + Multi-line comments + like so +#> + +#################################################### +## 1. Primitive Datatypes and Operators +#################################################### + +# Numbers +3 # => 3 + +# Math +1 + 1 # => 2 +8 - 1 # => 7 +10 * 2 # => 20 +35 / 5 # => 7.0 + # Powershell uses banker's rounding # Meaning [int]1.5 would round to 2 but so would [int]2.5 # division always returns a float. You must cast result to [int] to round @@ -440,7 +460,7 @@ function New-Website() { [int]$port = 3000 ) BEGIN { Write-Verbose 'Creating new website(s)' } - PROCESS { echo "name: $siteName, port: $port" } + PROCESS { Write-Output "name: $siteName, port: $port" } END { Write-Verbose 'Website(s) created' } } @@ -545,7 +565,7 @@ True False Guitar Instrument And tell us how many instances of each process we have running Tip: Chrome and svcHost are usually big numbers in this regard #> -Get-Process | Foreach ProcessName | Group-Object +Get-Process | Foreach-Object ProcessName | Group-Object <# Asynchronous functions exist in the form of jobs @@ -581,28 +601,45 @@ $Area You may one day be asked to create a func that could take $start and $end and reverse anything in an array within the given range based on an arbitrary array - Let's see one way to do that + Let's see one way to do that and introduce another data structure #> -$testArray = 'a','b','c','d','e','f','g','h','i','j','k','l','m','n' +$targetArray = 'a','b','c','d','e','f','g','h','i','j','k','l','m','n' -function Reverse-Range ($start, $end) { -[System.Collections.ArrayList]$newArray = @() -[System.Collections.ArrayList]$secondArray = @() +function Format-Range ($start, $end) { +[System.Collections.ArrayList]$firstSectionArray = @() +[System.Collections.ArrayList]$secondSectionArray = @() [System.Collections.Stack]$stack = @() - for ($i = 0; $i -lt $testArray.Length; $i++) { - if ($i -lt $start) { - $newArray.Add($testArray[$i]) > $null + for ($index = 0; $index -lt $targetArray.Count; $index++) { + if ($index -lt $start) { + $firstSectionArray.Add($targetArray[$index]) > $null } - elseif ($i -ge $start -and $i -le $end) { - $stack.push($testArray[$i]) + elseif ($index -ge $start -and $index -le $end) { + $stack.Push($targetArray[$index]) } - elseif ($i -gt $end) { - $secondArray.Add($testArray[$i]) > $null + elseif ($index -gt $end) { + $secondSectionArray.Add($targetArray[$index]) > $null } } - $endArray = $newArray + $stack.ToArray() + $secondArray - Write-Output $endArray + $returnArray = $firstSectionArray + $stack.ToArray() + $secondSectionArray + Write-Output $returnArray +} + +# The previous method works, but it uses extra memory by allocating new arrays +# It's also kind of lengthy +# Let's see how we can do this without allocating a new array +# This is slightly faster as well + +function Format-Range ($start, $end) { + while ($start -lt $end) + { + $temp = $targetArray[$start] + $targetArray[$start] = $targetArray[$end] + $targetArray[$end] = $temp + $start++ + $end-- + } + return $targetArray } ``` Powershell as a Tool: @@ -698,6 +735,7 @@ foreach ($server in $serverList) { Interesting Projects * [Channel9](https://channel9.msdn.com/Search?term=powershell%20pipeline#ch9Search&lang-en=en) PowerShell tutorials +* [KevinMarquette's Powershell Blog](https://powershellexplained.com/) Really excellent blog that goes into great detail on Powershell * [PSGet](https://github.com/psget/psget) NuGet for PowerShell * [PSReadLine](https://github.com/lzybkr/PSReadLine/) A bash inspired readline implementation for PowerShell (So good that it now ships with Windows10 by default!) * [Posh-Git](https://github.com/dahlbyk/posh-git/) Fancy Git Prompt (Recommended!) |