There is no selection of the types of mutation to produce viable sequence as there would be in a real organism. This program emulates mutation, not selection. Here is a sample session with msbar. These are only done if the sequence is nucleic. The output is a sequence file with 5 substitutions relative to the original sequence.
Data files None.
Diagnostic Error Messages None. It always exits with a status of 0. Known bugs None. This program is intended to be used by everyone and everything, from naive users to embedded scripts.