Get-Command is a PowerShell cmdlet that lists available commands, functions, aliases, and scripts in the current session. It helps identify what can be run, where it comes from, and whether a command name resolves to a cmdlet, function, or external executable.
What Get-Command Shows
Get-Command is most useful when you need to see how PowerShell resolves a name before you run it. That includes cmdlets, functions, aliases, scripts, and external executables, which makes it a practical way to understand what a command will actually invoke in the current session.
Because PowerShell can resolve the same name through multiple paths, the cmdlet helps avoid ambiguity. A short name might point to a built-in cmdlet in one environment, a function in another, or an executable on the PATH, so the result is a quick view of execution reality rather than just syntax.
Why Command Resolution Matters
Command discovery is not only about convenience. In managed environments, execution path and command precedence affect reliability, repeatability, and security posture. A harmless-looking name can hide a custom function, a wrapper script, or a different executable than the operator expected.
That distinction matters when teams standardise admin workflows, automate tasks, or troubleshoot inconsistent results across machines. If you understand what name resolution returns, you can better explain why a command behaved differently in one session than another.
How to Read the Output
Get-Command can return different object types, and those types are the key to interpreting the output. A cmdlet usually indicates a PowerShell-native command, a function often indicates session-scoped behaviour, an alias points to another command name, and an application entry indicates an external executable discovered through the system search path.
In practice, the name alone is often not enough. The command source, definition, and module context help you confirm whether you are calling trusted built-in logic, locally defined automation, or something loaded from elsewhere in the environment.
Operational Use in Admin Workflows
Operators often use Get-Command as a first validation step before building scripts, documenting runbooks, or diagnosing strange results. It can reveal whether a preferred command name is available at all, whether an alias is masking the underlying command, or whether a module needs to be imported before a function becomes visible.
It is also useful when standardising execution across systems, because the same command name may resolve differently depending on profile loading, module availability, path order, and session state. That makes it a small but important inspection tool for reliable administration.
Risk and Threat Considerations
Command resolution can become a security issue when a familiar name resolves to an unexpected function, script, or executable. If an operator assumes a built-in command is being used but a shadowed or tampered command is actually executed, the result can be misleading output, unwanted side effects, or malicious code execution.
Failure mechanism: Attackers or careless changes can alter session state, PATH order, aliases, or module contents so that trusted command names point to attacker-controlled logic instead of the intended tool.
Impact: This can support privilege abuse, persistence, and deception during administrative activity, especially when responders or automation rely on names without confirming the resolved source.
Standards & Framework Alignment
This section maps relevant standards and security frameworks to the operational risks and controls described in this guidance.
MITRE ATT&CK addresses the attack and risk surface, while CIS Controls v8 and NIST SP 800-53 Rev 5 set the governance and control requirements practitioners need to meet.
| Framework | Control / Reference | Relevance |
|---|---|---|
| MITRE ATT&CK | T1202 — Indirect Command Execution | Get-Command helps verify what execution path a command name will resolve to. |
| Recommendation — Map suspicious command resolution to T1202 and inspect for indirect execution through scripts or wrappers. | ||
| CIS Controls v8 | CIS-5 — Account Management | PowerShell command resolution is affected by session-scoped and administrative tooling controls. |
| Recommendation — Review administrative command sources and restrict unnecessary script and alias changes. | ||
| NIST SP 800-53 Rev 5 | CM-7 — Least Functionality | Command discovery supports validating that only intended tools and functions are available. |
| Recommendation — Limit available commands and modules to reduce unexpected execution paths. | ||
Practitioner Guidance
Why practitioners should care: Get-Command is a quick verification step, but it is only useful when operators treat name resolution as part of trust validation, not just as a convenience feature. In shared or automated environments, the resolved source should be checked before relying on a command for sensitive work.
Common misunderstanding: Many users assume that a familiar command name always means the same implementation. In PowerShell, the same name can map to different command types, so the visible name alone is not enough to establish what will run.
Practitioner takeaway: Use command resolution checks early when a script, alias, or admin workflow has security or change-impact implications, especially if the command may be shadowed by session content or local configuration.