Probably the most concise, direct description of how to
"customize" the behavior of sort can be found here:
perldoc -f sort
That will print out just the portion of the massive "perlfunc"
man page that discusses the "sort" function.
BTW, when you say "alphanumerical", do you really mean
"case-folded"? The output of the above command contains
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Want more info? How to link
or How to display code and escape characters
are good places to start.