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[Michele Dondi]

I said: "If you replace <DATA> with <> you can read from STDIN."
You said: "Not exactly. ..."

[snip]
If you replace <DATA> with <> you can read from STDIN, provided that
@ARGV is empty. If there is anything in @ARGV, the items will be
interpreted as file names and <> will read from them instead.

While this is a better approximation to the truth(TM) than what the OP
wrote, if we want to be really fussy it's not _entirely_ exact: try

perl -pe '' - -

arguably @ARGV is not empty.

Without qualifiers, your statement implied that <> always reads from
STDIN, and that is not exactly true.

Indeed.


Michele