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An interesting feature of Scala REPL is if you drop any jar in your %SCALA_HOME%\lib directory, it is available for import from the REPL. I have several jars there, and I often need to find out which ones are available to be included. So I always have to open another command window and find out which jars exist in that directory. It would be great if the REPL allowed me to execute system commands such as dir or ls or at least list all the jars in the above lib directory. What is the easiest way (if any) to invoke shell commands in REPL ?