Perl still supports the lower case forms of stdin, stdout and stderr: 

$ perl -le'/std/i && print for keys %::'
stderr
stdout
stdin
STDOUT
STDERR
STDIN

$ perl -le'print stdout "Hello" or die $!'
Hello

[download]

But to get it to work with strict and warnings enabled is a bit more difficult: 

$ perl -Mwarnings -Mstrict -le'print {*stdout} "Hello" or die $!'
Hello
$ perl -Mwarnings -Mstrict -le'print {\*stdout} "Hello" or die $!'
Hello

[download]

In reply to Re^2: Using associative arrays with I/O to interact with Prog. User by jwkrahn
in thread Using associative arrays with I/O to interact with Prog. User by dlapre01

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