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Computing with Data

elgeish
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PowerShell - Introduction

PowerShell is a command-line shell that provides a richer feature set for power users. Thanks to built-in support for the .NET Framework, PowerShell can be a more appealing shell to .NET developers when compared to Command Prompt.

Note: PowerShell examples in the book ran on Windows; the code on this website runs on Linux — the output may vary.

# This is a single-line comment
<#
This is a block comment...
It can span multiple lines
#>
# The prefix ## indicates an output line
# The Write-Host cmdlet writes output to a PowerShell host
# Host here refers to the process that's hosing PowerShell
Write-Host hello world
## hello world
Write-Host hello; Write-Host world
## hello
## world
# The first cmdlet below has the NoNewLine switch turned on
Write-Host -NoNewLine hello; Write-Host world
## helloworld
# The separator below is added between printed objects
Write-Host -Separator ", " hello world
## hello, world
# 0..9 creates an array of integers from 0 to 9
# Parentheses are required to evaluate the expression correctly
Write-Host -Separator ";" (0..9)
## 0;1;2;3;4;5;6;7;8;9
# The + operator below concatenates ranges
Write-Host -Separator ";" (0..9 + 8..0)
## 0;1;2;3;4;5;6;7;8;9;8;7;6;5;4;3;2;1;0
# The namespace prefix System is optional in PowerShell
Write-Host -Separator ([IO.Path]::PathSeparator) (0..9)
## 0;1;2;3;4;5;6;7;8;9
[String]::Join([IO.Path]::PathSeparator, 0..9)
## 0;1;2;3;4;5;6;7;8;9
# This is also an example of a multi-line entry
# When an entry is incomplete, you'll see this prompt: >>
# To complete the entry, press Enter after the last input
# Get-Date returns a DateTime object
(Get-Date).
AddDays(1).
ToUniversalTime().
ToLongDateString().
ToUpper()
## FRIDAY, MAY 13, 2016
# Example: comparing data extraction with Command Prompt
## rem ^ allows us to escape special characters
## for /f "tokens=4,5" %i in ('dir c:\test') ^
## do @if exist %j if %i neq ^<DIR^> echo %j %i
XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX
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