Known Issues

SecureString

The SecureString class is not the well-known C# SecureString, as the library is not available in .NET Core. However, PowerShell continues to use the type for two main reasons: FullCLR compatibility, and as a specially-treated type (that is, behavior is dependent on the type being SecureString). Instead, the SecureString is Mono's completely not secure whatsoever, but open-source and "compatible" stub that acts just like a plaintext StringBuilder. It has no encryption.

Additionally ReadLineSafe is not implemented, meaning Get-Credential fails with PlatformNotSupportedException.

Files excluded from the build

Microsoft.PowerShell.Commands.Management

The file ControlPanelItemCommand.cs is excluded from all frameworks in Microsoft.PowerShell.Commands.Management because it has dependency on [Shell32.ShellFolderItem] for FullCLR builds.

Microsoft.PowerShell.GraphicalHost

"ManagementList/CommonControls/ExpanderButtonAutomationPeer.cs",
"ManagementList/CommonControls/ExpanderButton.cs",
"ManagementList/CommonControls/ExpanderButton.Generated.cs",
"ManagementList/Common/PopupControlButton.cs",
"ManagementList/Common/PopupControlButton.Generated.cs"

Excluded because they requires UIAutomationTypes.dll

Microsoft.PowerShell.ConsoleHost

These are excluded from all builds with #if !PORTABLE. They require .NET types that are currently missing.

singleshell/installer/EngineInstaller.cs
singleshell/installer/MshHostMshSnapin.cs

Jobs

The PowerShell jobs fail, see #1010.

xUnit

The xUnit tests can only be run on Linux.

Console Output

Performance issues have been seen in some scenarios, such as nested SSH sessions. We believe this is likely an issue with Console.ReadKey() and are investigating.

Non-interactive console bugs

The ConsoleHost is buggy when running under an environment without a proper TTY. This is due to exceptions thrown in the RawUI class from System.Console that are silenced in the formatting subsystem. See issue #984.

Sessions

On Linux, PowerShell sessions do not work because of remoting requirements, so New-PSSession etc. crash.

Aliases

The aliases that conflict with native Linux / OS X commands are removed. This is an open discussion in issue #929. See commit 7d9f43966 for their removal, and 3582bb421 for the merge.

Unavailable cmdlets

This project includes the CoreCLR versions of the Commands.Management, Commands.Utility, Security, and PSDiagnostics modules.

The Archive, Diagnostics, PSGet, and Host modules are not yet included.

The WSMan.Management module cannot be included unless the Management.Infrastructure.Native library is ported.

The CoreCLR version of the Commands.Utility module does not contain the following cmdlets that exist in the FullCLR version:

ConvertFrom-String
ConvertTo-Html
Export-PSSession
Import-PSSession
Invoke-RestMethod
Invoke-WebRequest
Out-GridView
Out-Printer
Send-MailMessage
Show-Command
Update-List

File paths with literal backward slashes

On some filesystems (Linux, OS X), file paths are allowed to contain literal backward slashes, '', as valid filename characters. These slashes, when escaped, are not directory separators. In Bash, the backward slash is the escape character, so a path/with/a\\slash is two directories, path and with, and one file, a\slash. In PowerShell, we will support this using the normal backtick escape character, so a path\with\a``\slash or a path/with/a``\slash, but this edge case is currently unsupported.

That being said, native commands will work as expected. Thus this is the current scenario:

PS > Get-Content a`\slash
Get-Content : Cannot find path '/home/andrew/src/PowerShell/a/slash' because it does not exist.
At line:1 char:1
+ Get-Content a`\slash
+ ~~~~~~~~~~~~~~~~~~~~
    + CategoryInfo          : ObjectNotFound: (/home/andrew/src/PowerShell/a/slash:String) [Get-Co
   ntent], ItemNotFoundException
    + FullyQualifiedErrorId : PathNotFound,Microsoft.PowerShell.Commands.GetContentCommand

PS > /bin/cat a\slash
hi

The PowerShell cmdlet Get-Content cannot yet understand the escaped backward slash, but the path is passed literally to the native command /bin/cat. Most file operations are thus implicitly supported by the native commands. The notable exception is cd since it is not a command, but a shell built-in, Set-Location. So until this issue is resolved, PowerShell cannot change to a directory whose name contains a literal backward slash.

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