in reply to
How can I get the structure of mRNA in cmd and text page using a perl script?
mmmh... not sure if this is the place to copy a copyrigthed script, unless you have a permit from Cambridge University Press, probably shouldn't do this
... in any case, can you explain what do you mean with "get the structure"? Is your desired oputput like a 3d picture of a protein, or like a genetic plot, or something else? what are you trying to do?
Take a look to Vienna. Here are some perl scripts that can help you to start.