Variable

Declaration & Reference

Variable declaration and variable referencing shares a identical syntax.

Variable name must starts with $ but $ is not part of the name.

$var = 'foo'
echo $var

Variable Provider

PowerShell has builtin PSProvider for all variables named Variable:

Item Cmdlet for Variables

You may use Item cmdlets for manipulating variables since they're from a PSDrive. Typically useful when manipulating in batch.

When -ItemType unspecified and -Path were a path from variable drive, New-Item creates a variable.

ni -Path Variable:process -Name process -Value (gps)

There's not much necessity for using Item cmdlets for variables, you may use them but it doesn't seem to be straightforward.

Variable Cmdlet

• Get-Variable: retrieve variables from scope
• New-Variable: create variables with more options available
• Set-Variable: override value for variables
• Remove-Variable: delete variables from scope or pattern
• Clear-Variable: set variable to null

NOTE

All these variable cmdlets supports -Name that accepts pipeline input by property.

It's more recommended to use variable cmdlets since it supports more parameters to work with

• Scope: work with variables in certain scope