The dotnet ildasm provides a command-line IL dissassembler. Simply send the assembly path as a parameter and as a result you will get the IL contents of that assembly.

The project was created as a global CLI tool, therefore you can install with a single command:

dotnet tool install -g dotnet-ildasm

Note that for the command above to work, you need .NET Core SDK 2.1.300 or above installed in your machine.

dotnet ildasm <ASSEMBLY_PATH>
dotnet ildasm <ASSEMBLY_PATH> <-o|--output>
dotnet ildasm <ASSEMBLY_PATH> <-i|--item>
dotnet ildasm <-h|--help>

-i
Filter results by method and/or classes to be disassembled.

-o
Define the output file to be created with the assembly's IL.

Output IL to the command line:

dotnet ildasm myassembly.dll

Filter results by method and/or classes to be disassembled, showing the result in the command line:

dotnet ildasm myassembly.dll -i ClassName
dotnet ildasm myassembly.dll -i ::MethodName
dotnet ildasm myassembly.dll -i ClassName::MethodName

Define the file to be created with the output:

dotnet ildasm myassembly.dll -o disassembledAssembly.il