I think you're confusing ARGV with standard input, but it's not clear. If you want (in bash), the output of one program to be the arguments of another, you can use the backticks `` or $( ).
If you fix your programs by changing $arg shift @ARGV to $arg = shift @ARGV, then you can get the effect that I think you want by doing (in bash):
./two.pl $(./one.pl "one")
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