# scala > Scala application launcher and interactive interpreter. > More information: . - Start a REPL (interactive shell): `scala` - Start the interpreter with a dependency in the classpath: `scala -classpath {{filename.jar}} {{command}}` - Execute a Scala script: `scala {{script.scala}}` - Execute a `.jar` program: `scala {{filename.jar}}` - Execute a single Scala command in the command-line: `scala -e {{command}}`