A little bit of advice

While reviewing some scripts, I saw this quite a lot
chmod a+x *.pl
So everyone becomes execute rights. After some research I found out that this is not really needed only the user needed execute rights. So instead why didn't the author write
chmod u+x *.pl
I don't know but if everyone can execute your script you might have a security risk at hand. So never give everyone execute on your stuff.

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