To this day, the search for that fairly distinct string produces no results in Google despite the existence of this answer and the blog post giving it context.
How do you google for "-f>@+?*<.-&'_:$#/%!"
I came across this arcane bit of Perl:
Bonus points for explaining what it does.
The question is, how can you search Google for this string?
Write it out:
-f: perldoc -f -X. If no file name is specified (as is the case here) checks if
$_ contains the name of a plain file
>: Checks if the RHS is greater than the LHS
@+: In scalar context, returns the number of elements in
?: the conditional operator
*<: The glob for
.: String concatenation operator
-&'_: Invokes a subroutine
' is the
perl4 style package name separator. Try
perl -MHTML'Template -e 1.
: : Continuing with conditional operator
$# : The output format for printed numbers
/ : Division operator
%ERRNO; see perldoc perlvar
So, it is not impossible to understand if you put a little effort into it. Clearly, this is not how anyone should write programs, but there some benefit from people pushing the boundaries.