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Add validation to prevent duplicate alias names and definitions #27505

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Add validation to prevent duplicate alias names and definitions #27505

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ad712c4
Add validation to prevent alias name and definition from being the sa…
jserygit May 22, 2026
aee0cf6
Add blank line for improved readability in NewAliasCommand and SetAli…
jserygit May 22, 2026
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11 changes: 11 additions & 0 deletions src/Microsoft.PowerShell.Commands.Utility/commands/utility/NewAliasCommand.cs
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Original file line number Diff line number Diff line change
@@ -1,6 +1,7 @@
// Copyright (c) Microsoft Corporation.
// Licensed under the MIT License.

using System;
using System.Management.Automation;
using System.Management.Automation.Internal;

Expand Down Expand Up @@ -82,6 +83,16 @@ protected override void ProcessRecord()

AliasInfo result = null;

if (string.Equals(newAlias.Name, newAlias.Definition, StringComparison.OrdinalIgnoreCase))
{
PSArgumentException e = PSTraceSource.NewArgumentException("Value", NewObjectStrings.InvalidValue, newAlias.Name);
WriteError(
new ErrorRecord(
e.ErrorRecord,
e));
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return;
}

try
{
if (string.IsNullOrEmpty(Scope))
Expand Down
11 changes: 11 additions & 0 deletions src/Microsoft.PowerShell.Commands.Utility/commands/utility/SetAliasCommand.cs
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Original file line number Diff line number Diff line change
@@ -1,6 +1,7 @@
// Copyright (c) Microsoft Corporation.
// Licensed under the MIT License.

using System;
using System.Management.Automation;
using System.Management.Automation.Internal;

Expand Down Expand Up @@ -42,6 +43,16 @@ protected override void ProcessRecord()

AliasInfo result = null;

if (string.Equals(aliasToSet.Name, aliasToSet.Definition, StringComparison.OrdinalIgnoreCase))
{
PSArgumentException e = PSTraceSource.NewArgumentException("Value", NewObjectStrings.InvalidValue, aliasToSet.Name);
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WriteError(
new ErrorRecord(
e.ErrorRecord,
e));
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return;
}

try
{
if (string.IsNullOrEmpty(Scope))
Expand Down