if that's all input that you want uppercased, OFC that uc if your friend, as in:

perl -ne 'print uc' foo_input_file
# or
perl -pe '$_ = uc' foo_input_file
# or even ...
perl -pe 's/(.+)/\U$1\E/' foo_input_file
[download]

The last example shows (again) the power of RegExps, easily giving you the (usual) ability to uppercase only some 'wanted' item from the input lines like...

# capitalize words
perl -pe 's/\b(.)/\U$1\E/g' foo_input_file
# ...
[download]

--
AltBlue.