First install the tool

dotnet tool install -g dotnet-proj

See help with

dotnet proj --help

In

cd sdk2

Some examples of commands i, like

dotnet proj p2p c1/c1.fsproj

or

dotnet proj fsc-args c1/c1.fsproj
dotnet proj csc-args l2/l2.csproj

or

dotnet proj prop c1/c1.fsproj -get OutputType -get Version -get Configuration

It's possibile to pass usual .NET Core Tools arguments (like -c, -f, -r).

dotnet proj prop c1/c1.fsproj -get OutputType -c Release

And by default search for projects in current directory

cd l1
dotnet proj fsc-args -c Release

NOTE require msbuild in PATH (like in VS Command Prompt), or pass --msbuild with full path to msbuild

In

cd oldsdk

Like before

dotnet proj fsc-args l1/l1.fsproj

You can specify the msbuild to use

dotnet proj prop l1/l1.fsproj -get DocumentationFile --msbuild "C:\Program Files (x86)\Microsoft Visual Studio\2017\Enterprise\MSBuild\15.0\Bin\MSBuild.exe"

NOTE require msbuild in PATH (like in VS Command Prompt), or pass --msbuild with full path to msbuild

Run

dotnet proj net-fw

You can specify the msbuild to use

dotnet proj net-fw-ref System.Xml -f v3.5 --msbuild "C:\Program Files (x86)\Microsoft Visual Studio\2017\Enterprise\MSBuild\15.0\Bin\MSBuild.exe"