> ## Documentation Index
> Fetch the complete documentation index at: https://tally.wharflab.com/llms.txt
> Use this file to discover all available pages before exploring further.

# powershell/PSAvoidGlobalAliases

> Avoid global aliases.

`powershell/PSAvoidGlobalAliases` is a PSScriptAnalyzer diagnostic emitted by tally for PowerShell snippets embedded in Dockerfiles.

| Property | Value             |
| -------- | ----------------- |
| Severity | Warning           |
| Category | PSScriptAnalyzer  |
| Default  | Disabled in tally |
| Auto-fix | No                |

<Note>
  tally disables this rule by default for Dockerfile `RUN` snippets because a `RUN` executes
  statements inline rather than defining cmdlets, parameters, or modules with external callers. Re-enable it with
  `include = ["powershell/PSAvoidGlobalAliases"]` or by setting
  `rules.powershell.PSAvoidGlobalAliases.severity = "warning"` in `.tally.toml`.
</Note>

## Description

Globally scoped aliases override existing aliases in the session with matching names, which can cause
difficult-to-debug issues for consumers of modules and scripts.

To understand more about scoping, see `Get-Help about_Scopes`.

**NOTE** This rule is not available in PowerShell version 3 or 4 because it uses the
`StaticParameterBinder.BindCommand` API.

## How

Use other scope modifiers for new aliases.

## Examples

### Problematic code

```powershell theme={null}
New-Alias -Name Name -Value Value -Scope Global
```

### Correct code

```powershell theme={null}
New-Alias -Name Name1 -Value Value
```

## Source

This rule documentation is adapted from Microsoft's PSScriptAnalyzer documentation for
[AvoidGlobalAliases](https://github.com/MicrosoftDocs/PowerShell-Docs-Modules/blob/main/reference/docs-conceptual/PSScriptAnalyzer/Rules/AvoidGlobalAliases.md),
licensed under [CC BY 4.0](https://creativecommons.org/licenses/by/4.0/).