PowerShell/Docs/FAQ.md

PowerShell FAQ

What is PowerShell?

PowerShell is a task automation and configuration management framework from Microsoft, consisting of a command-line shell and associated scripting language.

Why use PowerShell?

✔️ it's powerful - fully control your computer

✔️ it's cross-platform - available for Linux, Mac OS and Windows

✔️ it's open-source and free - see the Github repository at: https://github.com/PowerShell/PowerShell

✔️ it's easy to learn - see the tutorial for beginners at: https://www.guru99.com/powershell-tutorial.html

✔️ it's fully documented - see the PowerShell documentation at: https://docs.microsoft.com/en-us/powershell/

How to install PowerShell?

• On Windows it's preinstalled. However, the execution policy is 'restricted' by default! To allow script execution: open the Windows PowerShell (Administrator) console and enter:

  PS> Set-ExecutionPolicy -ExecutionPolicy Bypass -Scope CurrentUser
  

• On CentOS, Debian, Docker, Fedora, macOS, openSUSE, Red Hat, Ubuntu visit https://github.com/PowerShell/PowerShell for installation.
• On Linux supporting Snaps install PowerShell by executing:

  $ snap install PowerShell
  $ ln -s /snap/bin/pwsh /usr/bin/pwsh
  

How to get the PowerShell Scripts?

• When using Git, execute in a terminal window: > git clone https://github.com/fleschutz/PowerShell
• When using Chocolatey, execute in Windows PowerShell (Administrator): > choco install powershell-scripts --version=0.4
• Otherwise, download and unzip it from: https://github.com/fleschutz/PowerShell/archive/master.zip

How to execute PowerShell Scripts?

1. In the Windows desktop: right-click the script and select: Execute with PowerShell
2. In a command-line interface (CLI, e.g. Windows Terminal, either local or remote via SSH) by typing: ./<FILENAME_OF_SCRIPT>.
3. By connecting a context menu item with a script.
4. By voice control, e.g. see repo talk2windows for more information.
5. By using automation software, e.g. Jenkins.
6. Automatically on login (see AutoStart folder)/logoff/daily/etc.

What about Security?

• Execute scripts only that you trust (and/or where you have checked the code before)!
• Prefer SSH Remoting instead of PowerShell Remoting
• More recommendations by NSA and cyber security centers in the U.S. (CISA), New Zealand (NZ NCSC), and the U.K. (NCSC-UK) can be found here: https://media.defense.gov/2022/Jun/22/2003021689/-1/-1/1/CSI_KEEPING_POWERSHELL_SECURITY_MEASURES_TO_USE_AND_EMBRACE_20220622.PDF

Why do some scripts show gibberish characters?

Those PowerShell scripts are using Unicode characters. Use a modern console supporting UTF-8 such as Windows Terminal, please.

How to set PowerShell as default shell on Linux?

Make sure PowerShell is installed, then execute: chsh -s /usr/bin/pwsh <username>. In case you experience an "invalid shell" error, add "/usr/bin/pwsh" to /etc/shells.

How to add the scripts to the search path?

Want to use the PowerShell scripts everywhere on the command-line? Then you need to add the Scripts/ subfolder to the search path:

• On Linux using Bash: edit .profile in your home directory and add the line: PATH="$PATH:/path/to/PowerShell/Scripts"
• On Windows: open Settings > System > About > Advanced system settings > Environment Variables, edit the user's variable "Path", and add the full path to the Scripts/ directory.

How to use PowerShell in Windows context menus?

• to enable "right-click > New > Windows PowerShell Script" execute Add_ps1_to_New_context_menu.reg in subfolder Data/
• to disable this execute Remove_ps1_from_New_context_menu.reg in subfolder Data/

Which editor to use for PowerShell scripts?

• Visual Studio Code - Supporting syntax highlighting, on-the-fly problem checking and an integrated PowerShell Console (available for free on Linux, Mac OS and Windows, now recommended by Microsoft).
• PowerShell ISE (Integrated Scripting Environment) - Former official PowerShell development environment included with Microsoft Windows.
• PowerShell Studio - Powerful PowerShell IDE with module, help, and user interface development tools, high DPI support and regular updates.
• PowerShell Plus - All in one IDE.
• Atom package - Add-on with PowerShell language support for Atom.
• SublimeText package - Add-on with PowerShell language support for Sublime Text.
• or your favorite text editor as an alternative.

How to write good PowerShell scripts?

Good PowerShell scripts are user-friendly and platform-independent. As a guideline follow these rules, please:

1. Use the <verb>-<object>.ps1 scheme to name the script.
2. Use UTF-8 BOM encoding to support Unicode characters in the script.
3. Add a comment-based help at the beginning with: synopsis, description, parameters, link, author, and license.
4. Check the requirements for the script, e.g. #Requires -RunAsAdministrator, or #Requires -Version 3
5. Prefer command-line options, else ask the user for help
6. Recommended is Set-StrictMode -Version Latest to enable additional error checking.
7. For readibility use UpperCamelCase for variables and functions, lowerCamelCase for everything else.
8. Set execute file permissions for Linux: chmod a+rx <filename>
9. On success exit with error code 0 (exit 0), otherwise print the error with keyword "ERROR:" (to support log parsers) and exit the error code (mostly 1)

Want to contribute or found a bug or issue?

If you find something bad (like a bug, error, or any issue), please report it here by open an Issue.

Or even better: Fork the repository, add or fix the script and submit a pull request, so others can participate too.

Your question is not answered here?

Send your question to: markus [at] fleschutz [dot] de