In the world of hackers, there are both good and bad. There are also some that are somewhere in-between on the spectrum. When you look at the entire rainbow of hacker hat colors, you will find that there are many variations at work in the modern world of technology.
Byobu is a wonderful tool that allows multiple sessions running in the background, even when the SSH session that launched them dies.
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Over the decades, cybercrime has evolved, branching out into many strains. There are black hat hackers - (the criminally motivated). crackers, (those breaking into systems to steal information), hacktivists, (infiltrators of computer systems to use them as platforms for public movements), and script kiddies, defined by WiseGeek.com as "teenagers who use readily available tools written by experienced hackers to deface websites or break into computer systems, usually done for peer recognition and attention."
Black hats vs white hats may sound like a spaghetti Western or a Parisian fashion show, but actually they make a clever way to distinguish between criminals who bypass computer systems for nefarious purposes and computer specialists who try to stop them.