Support for piping the output of `dotnet sln list`

I would like to use dotnet sln list in a script to automate some actions on projects. Unfortunately, the output of dotnet sln list is not suitable for piping into a script variable because it contains extraneous information.

Steps to reproduce

# powershell
$projectFiles = dotnet sln list

# bash
project_files=$(dotnet sln list)

Expected behavior

dotnet sln list should only produce output that lists the files, or support a flag like dotnet sln list --porcelain which suppresses the other info that breaks scripting.

Actual behavior

The first two lines of output are always irrelevant, and one first use, the output contains a welcome message that cannot be suppressed.

$ dotnet sln list

Welcome to .NET Core!
---------------------
Learn more about .NET Core: https://aka.ms/dotnet-docs
Use 'dotnet --help' to see available commands or visit: https://aka.ms/dotnet-cli-docs

Telemetry
---------
The .NET Core tools collect usage data in order to help us improve your experience. The data is anonymous. It is collected by Microsoft and shared with the community. You can opt-out of telemetry by setting the DOTNET_CLI_TELEMETRY_OPTOUT environment variable to '1' or 'true' using your favorite shell.

Read more about .NET Core CLI Tools telemetry: https://aka.ms/dotnet-cli-telemetry
Project(s)
----------
Abstractions/src/Microsoft.AspNetCore.DataProtection.Abstractions.csproj
Abstractions/test/Microsoft.AspNetCore.DataProtection.Abstractions.Tests.csproj
AzureKeyVault/src/Microsoft.AspNetCore.DataProtection.AzureKeyVault.csproj

Environment data

dotnet --info output:

.NET Core SDK (reflecting any global.json):
 Version:   3.0.100-preview-010184
 Commit:    c57bde4593

Runtime Environment:
 OS Name:     Mac OS X
 OS Version:  10.14
 OS Platform: Darwin
 RID:         osx.10.14-x64
 Base Path:   /Users/namc/src/aspnet/AspNetCore/.dotnet/sdk/3.0.100-preview-010184/

Host (useful for support):
  Version: 3.0.0-preview3-27414-8
  Commit:  2c740c0ea8

.NET Core SDKs installed:
  3.0.100-preview-010184 [/Users/namc/src/aspnet/AspNetCore/.dotnet/sdk]

.NET Core runtimes installed:
  Microsoft.AspNetCore.App 3.0.0-preview-19075-0444 [/Users/namc/src/aspnet/AspNetCore/.dotnet/shared/Microsoft.AspNetCore.App]
  Microsoft.NETCore.App 2.2.1 [/Users/namc/src/aspnet/AspNetCore/.dotnet/shared/Microsoft.NETCore.App]
  Microsoft.NETCore.App 3.0.0-preview-27324-5 [/Users/namc/src/aspnet/AspNetCore/.dotnet/shared/Microsoft.NETCore.App]
  Microsoft.NETCore.App 3.0.0-preview3-27414-8 [/Users/namc/src/aspnet/AspNetCore/.dotnet/shared/Microsoft.NETCore.App]

To install additional .NET Core runtimes or SDKs:
  https://aka.ms/dotnet-download

[walkermundo]

I too would like an option to the dotnet sln <SLN_FILE> list command to suppress the first two lines. It would be much cleaner to know that all output is usable and to not special case ignoring certain lines.

[woutervanvliet]

To remove the first two lines of output, you can use this solution: https://stackoverflow.com/a/24542679/803283

dotnet sln list | sed 1,2d

Or, if you’re unsure about how the output might change in the future:

dotnet sln ./build.sln list | grep -E \.csproj$