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Install PowerShell on MacOS
Execute script file
Version Logic: If Then Else
Strings
Curl

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This article describes the use of PowerShell scripting on Mac and Linux.

“PowerShell” refers to both the command-line shell and scripting language designed system administration.

PowerShell is an object-centered “management engine”that can be hosted in an application program.

CMD in Windows
PowerShell ISE (from Microsoft)
PowerGUI
SAPIEN Technologies PowerShell Studio
Idera PowerShell Pro

ISE = “Integrated Scripting Environment” is a GUI that providespopup tab completion and other assists.

PowerShell promises more consistency than the various commands added over time by various parties.

It reads Excel files natively as well as JSON, XML, and even ASCII.
Microsoft Deployment Toolkit
Microsoft System Center
IBM, etc.

Open source on Linux and MacOS

From the PowerShell and DSC Team YouTube channel:

This 51-minute series of demos was published Aug 18, 2016, the same dayPowerShell is open-sourced for all OSs at
https://github.com/PowerShell/PowerShell.

This article notes Desired State Configuration for Linux and the promise of SSH support arrived in 2014 (several months before Microsoft open sourced .NET and brought .NET Core to Linux). But “you had to author your scripts on the Windows platform, you had to configure things on the Windows platform and then deliver the desired configuration to a Linux box and have it be configured; now you can do all of that on Linux.”

Install PowerShell on MacOS

There is a brew powershell as of beta.7:

brew cask install powershell

Alternately, click to download the latest release for MacOS at:
https://github.com/PowerShell/PowerShell

Alternately, get back versions at
https://github.com/PowerShell/PowerShell/releases

Date	File	MB Size	Space	Cmds
Apr, 2018	6.0.2 on brew	50.8 MB
Sep 13, 2017	powershell-6.0.0-beta.7-osx.10.12-x64.pkg	50.8 MB
Sep 13, 2016	powershell-6.0.0-alpha.10.pkg	28.2 MB	? MB	345
Aug 10, 2016	powershell-6.0.0-alpha.9.pkg	37.1 MB	119.7 MB
Jul 26, 2016	powershell-6.0.0-alpha.7.pkg	25.0 MB
Jul 8, 2016	powershell-0.6.0.pkg	24.2 MB

</tr>

Open the .pkg file in the Downloads folder:
Click Continue, etc.
NOTE: For Windows: Microsoft Windows Management Framework 5.0
In and Out
Open a Terminal shell window to launch PowerShell:
powershell
Alternately:
pwsh
The response is “PS” in front of the file path prompt:
Check the version of PowerShell being used by calling a pre-defined variable:
$psversiontable
PROTIP: With PowerShell, a variable can act like a command.
Response:
QUESTION: What’s the CLRVersion?
Versions of PowerShell:
- 6.0 for Mac/Linux in Windows 10 Anniversay Edition
- 5.0 in 2015 for Visual Studio Code text editor
- 4.0 in 2014 with Windows 10 and .NET Framework 4.0 and Windows Management Framework 3.0
- 3.0 in 2012 with Windows 8/Server 2012
- 2.0 appeared in 2009
- 1.0 appeared in 2006
- Monad Manifesto published by Jeff Stover.
PROTIP: Know the PowerShell commands known not to work on Linux/macOS.
To leave PowerShell, it’s the same as in Bash scripts:
exit
When you return back in…
Get help information for a command:
get-help stop-service

Visual Studio Code Editor

One text editor built for PowerShell is Microsoft’s Visual Studio Code.

Install Visual Studio Code (see https://chocolatey.org/packages/VisualStudioCode):
choco install visualstudiocode -y
Install the PowerShell add-in to VSCode:
choco install vscode-powershell -y
Install the PowerShell Editor Services extension by pressing Ctrl+P, then type “ext install PowerShell” for a list of add-ins.
Ctrl+P is the universal search that also does “fuzzy search” of text in files open.
Click “install” of the extension named “PowerShell”.The icon turns to “installing”.
Open a directory containing PowerShell scriptsand open the File menu and select “Open Folder …”.Select the folder containing your scripts.
The scripts show up in the Explore tab of the Side Bar.
PROTIP: One advantage using VS Code is its Side Barenabling you to switch quickly among different files.
Press Ctrl+B to hide and unhide the Side Bar.
Press Ctrl+ to open a new editor window.
Up to three editor panes can be open at once.
Press Ctrl+1, 2, or 3 to switch among the files.
To edit user settings, press Ctrl+Shift+P, then type “user” and press enter.
Click on “powershell.scriptAnalysis.enable”.
Press Ctrl+Shift+&LT;period> to change value from true to false or back again.

Keith Hill notesdebugging support provided by the PowerShell Editor Services extension currently runs only on Windows.

Install .NET Core

PowerShell is written on top of .NET..NET’s previous dependencies on Windows components have been removedin .NET Core.

PowerShell errors occur if .NET Core is not installed, so:

Go to web page https://www.microsoft.com/net/core#macos
The web page asks for OpenSSL to be installed.
On a Mac:
Click the link to download the 50.3MB
dotnet-dev-osx-x64.1.0.0-preview2-003131.pkg
https://github.com/dotnet/core/blob/master/cli/known-issues.md
Run the installer (for 106.3MB of space).
Before installing anything or running through the update app, hit Command+i or pull down the File menu and choose “Show Files”:
- ./shared - Microsoft .NET Core 1.0.1 - Runtime
- ./host - Microsoft .NET Core 1.0.1 - Host FX Resolver
- ./dotnet
- ./sdk - Microsoft .NET Core 1.0.1 - SDK
These are folders within folder /usr/local/share under “Macintosh HD”.
Edit your Bash shell search PATH to include/usr/local/share/dotnet
atom ~/.bash_profile
An example:
Open a new Terminal shell window to run:
The response:
In a PowerShell invoke this to ensure that it can be done:

Execute script file

I like using script files rather than typing becauseit allows me to focus on the latest in what is usuallya long string of commands necessary in today’s complex world.

To call scripts, an example:

PROTIP: Make sure that when a file with .ps1 extension is clicked from Folder, the script is not launched to run, but that the script appears in a text editor.

A sample command to invoke the script including an execution policy :

Notice it’s “powershell” and not “powershell.exe” because Mac and Linux don’t recognize .exe.

When a script is signed, its location is locked to a specific full directory path, even when it’s in the current folder.

“remotesigned” is important because if this script has not been digitally signed, one needs to set PS execution policy to “RemoteSigned” (or “Unrestricted”) after reopening PowerShell as an Administrator to run:

By default PowerShell prevents the execution of PowerShell scripts on Windows systems.

Set-ExecutionPolicy RemoteSigned

Get a list of current security settings:

Get-ExecutionPolicy -List | Format-Table -AutoSize

See https://blog.netspi.com/15-ways-to-bypass-the-powershell-execution-policy/

https://github.com/MeshkDevs/InvokeTwitterAPIs

## Verify a signed script can be used #

Set
Set-ExecutionPolicy AllSigned

Install a signing cert on Mac

To add the CA root certificate (either PEM or DER format) into the OSX global keychain:

Use Finder to navigate to your /System -> Library -> Keychains -> X509Anchors to your own Library -> Keychains.
In a Terminal shell window, run command:
certtool i mycertificate.crt k=X509Anchors
Add a “d” at the end for DER format.
Copy your Library -> Keychains -> X509Anchors back to /System -> Library -> Keychains.
Use sudo.

Automatic logging

Increasingly, hackers are using PowerShell to create havoc.

So it’s a good idea to automatically logging using the start-transcript and stop-transcript commands.

BLAH: The sample script at https://github.com/wilsonmar/git-utilities/ps-auto-log.ps1,causes errors during execution of scripts.

Inside the file:

PROTIP: This can use up a lot of space quickly, so some management of its use is necessary.

Version Logic: If Then Else

I haven’t found a way to have a Bash script that can also be run as a PowerShell script.

PROTIP: Switching from Bash to PowerShell means a one-time migration and there is no turning back unless you want to maintainparallel scripts.

This is largely because of differences in if/then/else coding. The same if/then/else syntax in PowerShell scripts for Mac and PC is needed for the same script file to be used.

On Bash:

The question is whether a single PowerShell script can reallyrun on both Mac and Windows. Do a parallel run.

For different actions in PowerShell according to type of operating system:

NOTE: Because braces define actions, there is no “end if” (“fi”) in PowerShell.

Comparison Operators

-eq / -ne / -ge

-Like / -NotLike wildcard string - $name -Like “*sh”

-Match / -NotMatch regular expression - $name -Match “sh$”

-Contains / -NotContains a value in array - $name -contains “jo”

-In / -NotIn Is a value in an array - “joe” -in $name

Logical operators

-And

-Or

-Xor = Logical exclusive or.

Tilde and Providers

PROTIP: Use $home instead of the tilde (~)in PowerShell because tilde does not always represent the the user’s home folder as in Linux.This is because PS has different“providers” that include HKLM and HKCU top-levels in the Windows Registry.Get a list of providers and disk space:

Get-PSDrive

The response:

PowerShell calls files “items” as a term that groups files with registry keys and variables.

returns the Mode and LastWriteTime of the user.

Instead of “mkdir” to create folders, use

New-Item

To list files in a folder, it’s the same as in Bash:

ls -al

PowerShell cmdlets (command-lets) enables computers to be managed from the command line,much like Bash shell scripts on Linux machines.How many are there?

(get-command).count

https://github.com/pester/Pester/wiki/Mock

Handling secrets

PROTIP: Files containing secrets, such as passwords andcertificates are NOT stored in GitHub nor script files, but in a separate location, and backed up among other local files.

The secrets are retrieved into the script at run-time.

See my tutorial on GitHub Data Security

Hash tables

BTW, keys in a hash table must be unique.

Hash tables are used throughout PowerShell.

An example of a REST API call:

Sort a hash tables using the GetEnumertor():

Objects

Get-Service m* | where {$_.status -eq ‘running’} Get-Service m* | where status -eq ‘running’

The “$_” represents the current object in v2 can handle more complexity than v3 syntax:

Alias not parameters

Many Bash commands work in PowerShell (ls, cat, echo) becauseAliases make many commands in Bash scripts work:

get-alias echo

The response is “Write-Output”, which is what is executed.

BLAH: Many parameters to aliases are not recognized. For example, this common command results in an error:

ls -al

Instead, use:

dir -File | format-table

NOTE: dir is an alias to Get-ChildItem.

Thus,

Write-Host $env:computername -foreground Green

”–passthru” means do not go through Pipeline.

You can reset a default alias.

Environment Variables

PROTIP: Environment variables defined in Bash scripts can be read by PowerShell scripts and visa-versa.

Lists of environment variables:

The command “dir” is an alias of Get-ChildItem.

For the value of a single environment variable:

Get-ChildItem Env:USER Get-ChildItem Env:AWS_DEFAULT_REGION

Paths

Instead of “rm -rf” in Bash:https://blogs.technet.microsoft.com/heyscriptingguy/2012/02/22/the-best-way-to-use-powershell-to-delete-folders/

“-WhatIf” specifies a dry-run.

Combine files

Ro add the content of several files into a single text file:

Cmdlets

PS has some smarter parameters, such as filtering for files onlyand running recursively into sub-folders:

dir c:work*.ps1 -file -recurse

All PowerShell cmdlets follow a standardized verb-noun naming convention that makes it easy to look up, find, and use cmdlets.For a list of all the verbs:

get-verb

REMEMBER: Capitalization counts within PowerShell.

get-command -verb export get-command -noun ACL

paths

Only 25% of cmdlets are shipped with paths.

Strings

PROTIP: Don’t use “+” for string concatenation.

.NET Framework members

Initially built on Microsoft’s .NET Framework, PowerShell can refer to a static .NET member in square brackets with two colons to specify Pi:

[math]::pi

It’s wonderful that PowerShell doesn’t require an echo to display the value of objects.

To delete a file in the .NET I/O directory object:

Mac Powerline

The issue with using .NET objects is that they may execute in a different folder context than PowerShell.

TODO: $prompt

Other pre-defined variables

To count the number of cmdlets:
To get the current folder:
Alternatively, use (since v2):
This returns a PathInfo object.
$scriptDir = Split-Path -Path $MyInvocation.MyCommand.Definition -Parent

Dates

Based on http://ss64.com/ps/syntax-dateformats.html

Zip files using functions

Pipelines

Instead of just parsing text (as *Nix shells do),PowerShell works with objects in a pipeline.

Piping:

To list all variables defined and their values:

Get-Variable | Out-String

PROTIP: With PowerShell, it’s best to use out-file instead of “>” redirect character:

dir -file -hidden | out-file -filepath rootfiles.txt

Error handling:

Use preference variables for stream redirection:

1> Success 2> Error 3> Warning 4> Verbose 5> Debug

NOTE: Can Only merge to the success stream.

$Error is the automatic array that stores the last 256 exceptions (objects in error) - the default $MaximumErrorCount.

Error action preferences:

0 = Silently Continue
1 = Stop
2 = Continue
3 = Inquire
4 = Ignore [parameter value only]

Module to call REST API

This suggests:

PROTIP: To press the trailing back-tick that breaks up a command into several lines, press the key at the upper left corner of the keyboard with your left hand while you press shift key using your right hand.

A space character is required before the tick.

PROTIP: Break up long text into a string block (which Microsoft calls here-string):

The output is:

From https://apps.twitter.com/ define a new app. In Permissions tab, select Read-only. Click Update Settings. In Key and Access Tokens tab, click “Create my access tokens”. Copy the Consumer Key (API key) and paste in ~/.passwords as TWITTER_TOKEN.

It takes many lines to mess with OAuth, so I make use of Adam’s library for Twitter’s v1.1 API described at:
http://www.adamtheautomator.com/twitter-module-powershell/

https://gallery.technet.microsoft.com/scriptcenter/Tweet-and-send-Twitter-DMs-8c2d6f0a
called “Tweet and send Twitter DMs with Powershell”.
Adam’s “MyTwitter.psm1” I’ve download had 229 lines on 8/31/2014.
PROTIP: The “.psm1” extension means it’s a PowerShell module.
I used a text editor to edit the file to paste in variables for the 4 credentials from Twitter.
I then saved the module in the same GitHub folder as my script,and added a command to pull the module into the script:
Alternately, Copy-install the module to your $env:PSModulePath
See http://www.powershellgallery.com/gettingstarted
PowerShellGet from the Windows PowerShell Framework 5.0
The alternative is to put the module in the PSModulePath,which enables tab completion to complete the names of commands from modules that are not loaded.
The module has these functions:
- Get-OAuthAuthorization
- Send-Tweet
- Send-TwitterDm
Paste in your PowerShell script:
BTW, PowerShell cmdlets in https://github.com/Iristyle/Posh-GitHubis only for use on Windows.

Trevor Sullivan (@pcgeek86) made a 20:40 video Mar 17, 2016

A PowerShell Module for manipulating PowerShell ProfilesbyThomas Malkewitz

Curl

curl is an alias for Invoke-WebRequest in PowerShell.

Powerline Lat Machine

https://channel9.msdn.com/Blogs/trevor-powershell/Automating-the-GitHub-REST-API-Using-PowerShell

## JSON from REST API #

To extract out a key from the JSON file:

https://www.pluralsight.com/courses/powershell-modules-advanced-functions-building

Profile scripts

Jeff Hicks notes these profile scripts execute automatically at start:

To view all profiles:

$profile | select *

Folder	Script file	Script name
C:Windows System32 WindowsPowerShell v1.0	profile.ps1	AllUsersAllHosts
	Microsoft.PowerShell.profile.ps1	AllUsersCurrentHost
	Microsoft.PowerShellSE.profile.ps1	AllUsersCurrentHost (ISE)
C:Users<user>Documents WindowsPowerShell or /Users/<user>/ .config/powershell/	Microsoft.PowerShell.profile.ps1	CurrentUsersAllHosts*
	profile.ps1	CurrentUserCurrentHost
	Microsoft.PowerShellSE.profile.ps1	CurrentUserCurrentHost (ISE)

= This is the one shown when $profile is typed in.

API calls

Corporate IT departments often use Group Policies.

$Headers = “Authorization: token ${GITHUB_TOKEN}” echo “Headers=$Headers” # DEBUGGING

$Token=$GITHUBUSER +’:’+ $SECRETS.GITHUB_TOKEN; $Base64Token=[System.Convert]::ToBase64String([char[]]$Token); $Headers = @{ Authorization = ‘Basic(0)’ -f $Base64Token; }; # -f is for substitution of (0). # See https://technet.microsoft.com/en-us/library/ee692795.aspx # Write-Host (“Headers=”+$Headers.Authorization) $Headers = “{ Authorization: = Basic $GITHUB_TOKEN }” # -f is for substitution of (0). # See https://technet.microsoft.com/en-us/library/ee692795.aspx Write-Host (“Headers=”+$Headers)

Iterate