Иерархия Unix пользователей

https://www.levenez.com/unix/guru.html
People who come into contact with the UNIX system are often told : "If
you have trouble, see so-and-so, he's a guru", or "Bob there is a real
Unix hacker". Often they are baffled by these appellations, and do not
pursue the matter further. What is a "Unix Hacker ?". How does he differ
from a "guru" ? To answer these and other questions, here is the UNIX
HIERARCHY:

beginner

     * insecure with the concept of a terminal
     * has yet to learn the basics of vi
     * has not figured out how to get a directory
     * still has trouble with typing <RETURN> after each line of input

novice

     * knows that ls will produce a directory
     * use the editor, but calls it vye.
     * has heard of C but never used it
     * has had his first bad experience with rm
     * is wondering how to read his mail
     * is wondering why the person next to him seems to like Unix so very much

user

     * uses vi and nroff, but inexpertly
     * had heard of regular-expr's but never seen one
     * uses egrep to search for fixed strings
     * has figured out that '-' precedes options
     * is wondering how to move a directory
     * has attempted to write C program and has decided to stick with pascal
     * thinks that sdb is a brand of stereo component
     * knows how to read his mail and is wondering how to read the news

knowledgeable user

     * uses nroff with no trouble, and is beginning to learn tbl and eqn
     * thinks that fgrep is fast grep
     * has figured out that mv will move directories
     * has learned that learn doesn't help
     * somebody has shown him how to write C programs
     * once used sed to do some text substitution
     * has seen sdb used but does not use it himself
     * thinks that make is only for wimps

expert

     * uses sed when necessary
     * uses macro's in vi, uses ex when necessary
     * posts news at every possible opportunity
     * writes csh scripts occasionally
     * writes C programs using vi and compiles with cc
     * has figured out what && and || are for
     * thinks that human history started with !h

hacker

     * uses sed and awk with comfort
     * uses undocumented features of vi
     * writes C code with cat > and compiles with !cc
     * uses adb because he doesn't trust source debuggers
     * can answer questions about the user environment
     * writes his own 'nroff' macros to supplement standard ones
     * writes scripts for Bourne shell (/bin/sh)

guru

     * uses m4 and lex with comfort
     * writes assembly code with cat >
     * uses adb on the kernel while system is loaded
     * customizes utilities by patching the source
     * reads device driver source with his breakfast
     * can answer any Unix question after a little thought
     * uses make for anything that requires two or more distinct commands to archive
     * has learned how to breach security, but no longer needs to try

wizard

     * writes device drivers with cat >
     * fixes bugs by patching the binaries
     * can answer any question before ask
     * writes his own troff macro packages
     * is on first-name basis with Dennis, Bill and Ken