PowerShell uses different profile files depending on which Host, or application you’re using.

Below are the defaults for PowerShell 5.1

All Users, All Hosts (PowerShell console, ISE) – $PSHOME\Profile.ps1

All Users, Current Host (PowerShell console) – $PSHOME\Microsoft.PowerShell_profile.ps1

All User, Current Host (VS Code) – $PSHOME\Microsoft.VSCode_profile.ps1

Current User, All Hosts (PowerShell console, ISE) – $HOME\Documents\WindowsPowerShell\Profile.ps1

Current user, Current Host (PowerShell console) – $HOME\Documents\WindowsPowerShell\Microsoft.PowerShell_profile.ps1

Current user, Current Host (VS Code) – $HOME\Documents\WindowsPowerShell\Microsoft.VSCode_profile.ps1

To edit or create each of the profile files, you can use the following commands with the $Profile variable:

Current User, Current Host – notepad $PROFILE

Current User, Current Host – notepad $PROFILE.CurrentUserCurrentHost

Current User, All Hosts – notepad $PROFILE.CurrentUserAllHosts

All Users, Current Host – notepad $PROFILE.AllUsersCurrentHost

All Users, All Hosts – notepad $PROFILE.AllUsersAllHosts

If you’re an avid user of PowerShell you’ve probably, at some point gotten sick of providing values for the same parameters over and over. The solution, use $PSDefaultParameters. Using this preference variable you can set default values like the DC used with the AD cmdlets, the SQL server you connect to, or the error preference for all cmdlets or a subset. This means you can essentially pre-enter the desired value once, and the cmdlet will automatically use it. Pretty cool, huh?

Examples:
$PSDefaultParameterValues["*-AD*:Server"] = "dc01.corp.viamonstra.com"

Add/Remove single entries:
$PSDefaultParameterValues.Add('Get-ADComputer:Server', 'dc01')
$PSDefaultParameterValues.Remove('*-GPO:Name')

The $PSDefaultParameterValues variable is only available in the session you set it in. The easiest way to take advantage of $PSDefaultParameterValues is to add them to you PowerShell profile. That way each time you start a PowerShell session, the default values are already set for you.

PowerShell profile example:
$PSDefaultParameterValues['Get-ChildItem:Force'] = $true
$PSDefaultParameterValues[':ErrorAction'] = 'Stop' $PSDefaultParameterValues['Get-:Recurse'] = $true

Here is a link to Microsoft’s documentation of $PSDefaultParameters.