help with perl

I have this problem to solve but i don't know how!

Develop a Perl program that receives as argument on the command line
the name of a file in the working directory (containing one DNA
sequence in FASTA format) and prints the content of the file with the
whole sequence in uppercase character.
-It checks the number of arguments received on the command line and if
the number is not 1 it prints an error message and exits.

Can anyone tell me how to develop this fuctions with perl?
.

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