There are currently six default profiles controlling PowerShell sessions, so refer to the Microsoft dev blog for more information. With this line added, any PowerShell session launched instantiates the FOO environment variable and sets its value to hello world. PS> Add-Content -Path $Profile.CurrentUserAllHosts -Value '$Env:FOO = 'hello world'' When you create a normal variable, the variable is considered local, meaning that it’s not defined outside of the shell that created it. How are they different from regular variables? Or, you might choose to add an environment variable to suit your preferences. Sometimes, when you’re installing something outside of your operating system’s intended toolset, you may have to manage an environment variable yourself. However, the USER variable is used by several different processes to identify who is requesting a service.Īn installer wizard, like the open source Nullsoft Scriptable Install System (NSIS) framework, updates your environment variables when you’re installing a new application. Your PATH variable is vital to your shell, for instance, but a lot less significant to, say, Java (which also has paths, but they’re paths to important Java libraries rather than general system folders). What are environment variables used for?ĭifferent environment variables get used by several different systems within your computer.

If you’re not familiar with using variables in PowerShell, read my variables in PowerShellarticle before continuing. If you want to make permanent changes to a variable, you must change them in Windows Registry on Windows, or in a shell configuration file (such as ~/.bashrc) on Linux or Mac. Like other variables, anything you set during a session only applies to that particular session. MODULEPATH /etc/scl/modulefiles:/etc/scl/modulefilesĮnvironment variables can be set, recalled, and cleared with some of the same syntax used for normal variables. PS> Get-ChildItem Env: | out-host -paging

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