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I stumbled upon B::Lint's magic-diamond documentation which states that <> (also known as <ARGV>) internally uses perl's two-argument open.

This means that if <> encounters a filename "rm * |  " (just has to end with pipe "|" and optional whitespace), then it executes the shell command 'rm *'. Example:
$ mkdir diamondtest $ cd diamondtest $ touch 'rm * | ' a b c d # create 5 files $ ls # now you see it $ perl -pe 1 * $ ls # now you don't -- no files

Shouldn't this be fixed with 3-argument open? I really like the magic-diamond for quick one-liners, but this just sounds all the security/robustness alarm bells.

Any recommended idioms to replace the following?

Update: An idiom would be to use ARGV::readonly

Update 2: If you're like me and like to write lots of one-line filters like:
    # strip blank lines perl -pe 's=^\s*$=='

as an idiom, add the taint switch -T:

I don't fully agree with it, but it's the least we've got to curb the <ARGV> magic, besides ARGV::readonly, and not compromise the terseness of the one-liner.

In reply to magic-diamond <> behavior -- WHAT?! by repellent

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    [marto]: they already have an entire BMC patrol system, which they disabled, because it was sending out spurious messages. So rather than fix the issue, or even find out what it was, they turned it off. No messages, can't be any problems, right?
    [Corion]: marto: But having open tickets / incidents increases the pressure on them ;) Of course, likely your contract / SLA specifies an upper limit for the number of incidents :-D
    [Corion]: marto: Ow ...
    [marto]: Corion They don't get into trouble for the number of tickets, or even breached tickets they have
    [marto]: which is a core issue with the client
    [Corion]: marto: Yeah, I can imagine that
    [choroba]: create a ticket if the number of tickets reaches a limit
    [choroba]: how deep meta could it go?

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