Great. Just noticed that we can provide a list too in split function. The docs however mention EXPR --split /PATTERN/, EXPR-- which I assumed to be a scalar.
Anyways thanks for the help.
This was what I wanted to achieve:
perl -e 'print chr(ord()+1) foreach(split //,`cat file.pl`);'
(a simple one liner to encrypt a file via ascii shift).
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