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[powershell/en] Adding some things I find useful

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Andrew Ryan Davis 2020-05-16 19:26:29 -07:00 committed by GitHub
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@ -55,6 +55,11 @@ The tutorial starts here:
```powershell ```powershell
# As you already figured, comments start with # # As you already figured, comments start with #
<#
Multi-line comments
like so
#>
# Simple hello world example: # Simple hello world example:
echo Hello world! echo Hello world!
# echo is an alias for Write-Output (=cmdlet) # echo is an alias for Write-Output (=cmdlet)
@ -68,6 +73,8 @@ $aString="Some string"
# Or like this: # Or like this:
$aNumber = 5 -as [double] $aNumber = 5 -as [double]
$aList = 1,2,3,4,5 $aList = 1,2,3,4,5
# Reverse an array *Note this is a mutation on the existing array
[array]::Reverse($aList)
$anEmptyList = @() $anEmptyList = @()
$aString = $aList -join '--' # yes, -split exists also $aString = $aList -join '--' # yes, -split exists also
$aHashtable = @{name1='val1'; name2='val2'} $aHashtable = @{name1='val1'; name2='val2'}
@ -100,6 +107,10 @@ echo "Bound arguments in a function, script or code block: $PSBoundParameters"
echo "Unbound arguments: $($Args -join ', ')." echo "Unbound arguments: $($Args -join ', ')."
# More builtins: `help about_Automatic_Variables` # More builtins: `help about_Automatic_Variables`
# Find the datatype of variables or properties you're working with
$true.GetType()
$aHashtable.name2.GetType()
# Inline another file (dot operator) # Inline another file (dot operator)
. .\otherScriptName.ps1 . .\otherScriptName.ps1
@ -184,7 +195,7 @@ Get-Process | Sort-Object ID -Descending | Select-Object -First 10 Name,ID,VM `
Get-EventLog Application -After (Get-Date).AddHours(-2) | Format-List Get-EventLog Application -After (Get-Date).AddHours(-2) | Format-List
# Use % as a shorthand for ForEach-Object # Use % as a shorthand for ForEach-Object
(a,b,c) | ForEach-Object ` ('a','b','c') | ForEach-Object `
-Begin { "Starting"; $counter = 0 } ` -Begin { "Starting"; $counter = 0 } `
-Process { "Processing $_"; $counter++ } ` -Process { "Processing $_"; $counter++ } `
-End { "Finishing: $counter" } -End { "Finishing: $counter" }
@ -198,12 +209,13 @@ ps | Format-Table ID,Name,@{n='VM(MB)';e={'{0:n2}' -f ($_.VM / 1MB)}} -autoSize
### Functions ### Functions
# The [string] attribute is optional. # The [string] attribute is optional.
function foo([string]$name) { # Function names should follow Verb-Noun convention
function Get-Foo([string]$name) {
echo "Hey $name, have a function" echo "Hey $name, have a function"
} }
# Calling your function # Calling your function
foo "Say my name" Get-Foo "Say my name"
# Functions with named parameters, parameter attributes, parsable documentation # Functions with named parameters, parameter attributes, parsable documentation
<# <#
@ -283,7 +295,22 @@ Pop-Location # change back to previous working directory
# Unblock a directory after download # Unblock a directory after download
Get-ChildItem -Recurse | Unblock-File Get-ChildItem -Recurse | Unblock-File
# You can also pass arguments to a Function with a hash table
# This is called Splatting
# Normal Command
Export-Csv -InputObject $csv -Path 'c:\mypath' -Encoding UTF8 -NoTypeInformation
# With Splatting
$csvArguments = @{
InputObject = $csv
Path = 'c:\mypath'
Encoding = 'UTF8'
NoTypeInformation = $true
}
Export-Csv @csvArguments
# Open Windows Explorer in working directory # Open Windows Explorer in working directory
Invoke-Item .
# Or the alias
ii . ii .
# Any key to exit # Any key to exit
@ -318,6 +345,7 @@ Interesting Projects
* [PSGet](https://github.com/psget/psget) NuGet for 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!) * [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!) * [Posh-Git](https://github.com/dahlbyk/posh-git/) Fancy Git Prompt (Recommended!)
* [Oh-My-Posh](https://github.com/JanDeDobbeleer/oh-my-posh)
* [PSake](https://github.com/psake/psake) Build automation tool * [PSake](https://github.com/psake/psake) Build automation tool
* [Pester](https://github.com/pester/Pester) BDD Testing Framework * [Pester](https://github.com/pester/Pester) BDD Testing Framework
* [Jump-Location](https://github.com/tkellogg/Jump-Location) Powershell `cd` that reads your mind * [Jump-Location](https://github.com/tkellogg/Jump-Location) Powershell `cd` that reads your mind