$ vtm -h
Usage: vtm [programfile] [switches]
-h         Display this help.
-F         Finite tape mode.
-I         Infinite tape mode (well, it grows anyway) (default).
-S         Show the state at the end of each line (default).
-T         Don't show the state at the end of each line.
-V         Shows tape, blank character, and starting state before running.
-W         Don't show anything before running.
-Q         Ignore ##echo directives.
-L         Enable ##echo directives.
-0         Show zero lines of output per step; only show the final tape.
-1         Show one line of output per step of the Turing machine (default).
-2         Show two lines of output per step of the Turing machine.
-tXXX...   Set the value of the initial tape.
-bC        Set the value of the blank character.
-sState    Set the value of the starting tape.

If the values of the tape, blank character, or starting state are not set with
command-line arguments, and the program file does not specify default values,
then you will be prompted for the missing values.

Command-line arguments will override progam file's default settings.

Example:
    vtm -t_111_111_ -b_ -spass_first add.vtm
will execute the add.vtm with the tape set to "_111_111_", blank to "_", and 
the starting state to "pass_first".