Editing Windows PowerShell Cookbook

[[Category:Powershell]] [[Category:Windows]]
== Fetching remote content ==

=== Download content from the web ===

This will print out the markup from the index page (which could then be piped through additional commands):

<syntaxhighlight lang="powershell">
> (new-object Net.WebClient).DownloadString("http://damienjay.com/")
</syntaxhighlight>

== Grep/Searching the content of files ==

=== Files in a single directory ===

<syntaxhighlight lang="powershell">
> select-string .\*.* -pattern "\my_regexp\"
</syntaxhighlight>

=== Recursive search ===

<syntaxhighlight lang="powershell">
> gci path\to\search\root\ -rec | select-string -pattern "\my_regexp\"
</syntaxhighlight>

=== Recursive search filtered by file type ===

<syntaxhighlight lang="powershell">
> Get-ChildItem path\to\search\root\ -include *.txt -rec | select-string -pattern "\my_regexp\"
> # or, using aliases for the commands and not using "-include" ...
> gci path\to\search\root\ *.txt -r | sls -pattern "\my_regexp\"
</syntaxhighlight>

== List directory contents ==

[http://technet.microsoft.com/en-us/library/ee692796.aspx Fun Things You Can Do With the Get-ChildItem Cmdlet] (Microsoft TechNet)

<syntaxhighlight lang="powershell">
> Get-ChildItem .\
> # or...
> gci .\
> # or...
> gci # for the current directory
</syntaxhighlight>

=== Limit listing to file names ===

<syntaxhighlight lang="powershell">
> gci path\to\directory | Select-Object Name
> # or...
> Get-ChildItem path\to\directory -name
</syntaxhighlight>

=== Recursive listing ===

<syntaxhighlight lang="powershell">
> gci -recursive
> # or...
> gci -rec
</syntaxhighlight>

== Environment variables ==

Displaying, creating, and modifying environment variables using Powershell CLI.<ref>[https://technet.microsoft.com/en-us/library/ff730964.aspx Creating and Modifying Environment Variables] - Microsoft TechNet</ref>

See also [[Powershell Environment Configuration]].

=== List all environment variables ===

<syntaxhighlight lang="powershell">
> Get-ChildItem Env:
> # (or using gci alias...)
> gci env:
</syntaxhighlight>

=== Display value of a single environment variable ===

`$Env:` followed by the variable name, e.g.:

<syntaxhighlight lang="powershell">
> $Env:OS
</syntaxhighlight>

=== Creating and modifying environment variables ===

==== Creating a process-level environment variable ====

<syntaxhighlight lang="powershell">
> $env:TestVariable = "This is the test variable value."
</syntaxhighlight>

==== Creating a permanent environment variable ====

<syntaxhighlight lang="powershell">
> [Environment]::SetEnvironmentVariable("TestVariable", "Test value.", "User")
</syntaxhighlight>

<div class="alert alert-warning">N.B. It's necessary to create a new Powershell instance to refer to new environment variable values.</div>

==== Deleting an environment variable ====

<syntaxhighlight lang="powershell">
> Remove-Item Env:TestVariable
> # (or...)
> [Environment]::SetEnvironmentVariable("TestVariable", $null, "User")
</syntaxhighlight>

== Notes ==
<references />