How to write a Perl script to convert file to all upper case? -

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how can write perl script convert text file upper case letters?

perl -ne "print uc" < input.txt

the -n wraps command line script (which supplied -e) in while loop. uc returns all-uppercase version of default variable $_, , print does, well, know yourself. ;-)

the -p -n, print in addition. again, acting on default variable $_.

to store in script file:

#!perl -n print uc;

call this:

perl uc.pl < in.txt > out.txt

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