Error actions
The -ErrorAction parameter and the ErrorActionPreference variable are used to control what happens when a non-terminating error is encountered, subject to the previous notes about throw.
The -ErrorAction parameter is made available on a command when the CmdletBinding attribute is present. The CmdletBinding attribute is implicitly added if one or more parameters in a script use the Parameter attribute.
By default, -ErrorAction is set to Continue. Non-terminating errors will be displayed, but a script will continue to run.
$ErrorActionPreference is a scoped variable, which you can use to affect all commands in a particular scope and any child scopes. By default, $ErrorActionPreference is set to Continue. You can override the variable in child scopes (such as a function inside a script).
All errors in a session are implicitly added to the reserved variable $Error unless the error action is set to Ignore. Now, $Error is an ArrayList and contains...