in reply to
How can I get the structure of mRNA in cmd and text page using a perl script?
"May I request perlmonks to suggest me what I should do to view the secondary structure in cmd and to get the structure in the text output file?"
You've asked several questions like this in the past (e.g. How can I generate random DNA using the code given by James Tisdall?). Since you seem to be a bioinformatics student wouldn't it make more sense if you learned how to use the tools you've chosen to work with?