Get definition of function and echo the code

For a function called test:

$function:test

Or if the function name contains a hyphen (eg. test-function):

${function:test-function}

Alternatively:

(Get-Command test).Definition

(Get-Command Test).Definition

That is how I normally get definitions.

The current answers will only work for functions that have been created locally. You can, for example, see the definition of native functions like Get-EventLog.

For a list of all the available functions, you can run:

Get-ChildItem Function::

Any of these can be passed into ${function:myFn} or (Get-Command myFn).Definition

If you want to peek at native functions, you can run this code:

$metadata = New-Object system.management.automation.commandmetadata (Get-Command Get-EventLog)
[System.management.automation.proxycommand]::Create($MetaData) | out-file C:\Get-EventLog.ps1