[PowerShell/en] intro

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+---
+category: tool
+tool: powershell
+contributors:
+    - ["Wouter Van Schandevijl", "https://github.com/laoujin"]
+filename: LearnPowershell.ps1
+---
+
+PowerShell is the Windows scripting language and configuration management framework from Microsoft built on the .NET Framework. Windows 7 and up ship with PowerShell.  
+Nearly all examples below can be a part of a shell script or executed directly in the shell.
+
+A key difference with Bash is that it is mostly objects that you manipulate rather than plain text.
+
+[Read more here.](https://technet.microsoft.com/en-us/library/bb978526.aspx)
+
+```powershell
+# As you already figured, comments start with #
+
+# Simple hello world example:
+echo Hello world!
+# echo is an alias for Write-Output (=cmdlet)
+# Most cmdlets and functions follow the Verb-Noun naming convention
+
+# Each command starts on a new line, or after semicolon:
+echo 'This is the first line'; echo 'This is the second line'
+
+# Declaring a variable looks like this:
+$Variable="Some string"
+# Or like this:
+$Variable1 = "Another string"
+
+# Using the variable:
+echo $Variable
+echo "$Variable"
+echo '$($Variable + '1')'
+echo @"
+This is a Here-String
+$Variable
+"@
+# Note that ' (single quote) won't expand the variables!
+# Here-Strings also work with single quote
+
+# Builtin variables:
+# There are some useful builtin variables, like
+echo "Booleans: $TRUE and $FALSE"
+echo "Empty value: $NULL"
+echo "Last program's return value: $?"
+echo "Script's PID: $PID"
+echo "Number of arguments passed to script: $#"
+echo "All arguments passed to script: $Args"
+echo "Script's arguments separated into different variables: $1 $2..."
+
+# Reading a value from input:
+$Name = Read-Host "What's your name?"
+echo "Hello, $Name!"
+[int]$Age = Read-Host "What's your age?"
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