
          tcl [-q] [[-f] script]|[-c command] [args]

          Tcl starts the interactive Tcl command interpreter.  The Tcl
          shell provides an environment for writing, debugging and
          executing Tcl scripts.  The functionality of the Tcl shell
          can also be obtained in any Tcl-based application.

          The tcl command, issued without any arguments, invokes an
          interactive Tcl shell.  If script is specified, then the
          script is executed noninteractively with args being supplied
          in the Tcl variable `argv'.  If command is supplied, then
          this command (or series of commands, separated by `;') is
          executed, with `argv' containing args.

          The Tcl shell is intended as an environment for Tcl program
          development and execution.  While it is not a full-featured
          interactive shell, it provides a comfortable environment for
          the interactive development of Tcl code.  Note that the
          package library code described here overrides the unknown
          command provided as part of the standard Berkeley Tcl
          library facility, although Tcl source libraries coded to
          that standard can be loaded and used by Extended Tcl.
