Detailed Linux Boot Process

Linux boot process is based, among others, on the System-V filed structure. Can read more on this article.

http://www.ccoss.org/tutorials/lfs/Linux_from_Scratch_A_Tour.htm

Fedora boot process, in more detail:

http://openskills.info/infobox.php?ID=228

High leveling common tools

Tools like bash worths a "man bash" reading. You can even make recursive scripts! Lets play...

#!/bin/bash

function generalista ()
{
    if [ $1 == "0" ] || [ $1 == "1" ]
    then
            echo 1
    else
            VARF=$(($1-1))
            echo $VARF
            generalista $VARF
    fi
}

if [ "$#" == "1" ]
then
    if [ $1 -ge 0 ]
    then
            time LISTA=$(generalista $1)
            echo El factorial es el producto de los factores de esta lista : $LISTA
            FACTORIAL=1;
            for FACTOR in $LISTA
            do
                    TEMP=$(($FACTORIAL*$FACTOR))
                    FACTORIAL=$TEMP
            done
            echo Entonces, el factorial de $1 es $FACTORIAL, aunque eso no es correcto...
    else
            echo Error: integer MUST be positive
    fi
else
    echo Usage: $0 positive_integer
fi

Bash humor quotes database aids

#!/bin/bash

FORTFILE=/home/rodolfoap/bin/fortunes.mine
EDITOR=vi

HLPTXT=$(cat <<EOT
GNU fortunes is a personal fortunes engine organizer, written in bash.

Usage: fortunes [OPTION]

Options:
      -e              edit fortunes file
      -l              enters learning mode
      -m              enters multiline-learning mode
      --help          shows this help
      --version       shows version

Examples:

      fortunes --help shows this help
      fortunes -e             edits fortunes file
      fortunes                generates a random fortune
      fortunes -l             starts learning mode

Report bugs to rodolfoap@hotmail.com
EOT)

VERTXT=$(cat <<EOT
GNU fortunes v0.1

Copyright (C) 1999 Free Software Foundation, Inc.
This is free software; see the source for copying conditions.  There is NO
warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.

Written by Rodolfo Alcazar 
EOT)

case "$1" in
      "")
              fortune $FORTFILE
              ;;
      "-e")
              $EDITOR $FORTFILE
              /usr/sbin/strfile $FORTFILE
              echo
              ;;
      "-l")
              echo "Entering learning mode."
              echo
              read -p "> " QUE
              echo -e "$QUE\n%" >> $FORTFILE
              echo
              /usr/sbin/strfile $FORTFILE
              ;;
      "-m")
              echo "Entering multiline learning mode. End questions and answers with ^D."
              echo
              echo -n "> "
              QUE=$(cat)
              echo -e "$QUE\n%" >> $FORTFILE
              echo
              /usr/sbin/strfile $FORTFILE
              ;;
      "-h"|"--help")
              echo "$HLPTXT"
              ;;
      "-v"|"--version")
              echo "$VERTXT"
              ;;
esac

Fun, hah? With this basics I've wrote a flashcards studying tool. Drop me a line if you want it. Even better, you can write your own!