# Linux course syllabus

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## Beginner / Session 01

### Introduction

  * Unix philosophy: Do One Thing and Do It Well (DOTADIW)
  * How deep is deep enough
  * Style is made of certain conscious choices
  * Issues: Speed(Google), Concentration(Questions), Boundaries(Sysadmin, DevOps, Programmer)
  * Note-taking: Zettelkasten, Second Brain, Obsidian, TiddlyWiki, DokuWiki
  * Muscle memory
  * Dynamic syllabus
  * Linux is a family of open-source Unix-like operating systems based on the Linux kernel, an operating system kernel first released on September 17, 1991, by Linus Torvalds
  * https://distrowatch.com : Debian/Ubuntu/RedHat/CentOS/Fedora/ArchLinux/Manjaroi/Mint/Kali/Slackware
  * http://lxer.com : Linux News

### Installation

  * Debian
  * amd64 / i386 / netinstall
    * LVM / RAID / Encryption
    * SSH

### Quick Tour

  * Login
  * logout / exit / <ctrl+d>
  * clear / <ctrl+l>
  * reboot / poweroff
  * passwd
  * Virtual Terminals: Alt-F1, Alt-F2, ...
  * Shift-PgUp, Shift-PgDn
  * ssh client / putty
  * ls -lha
  * pwd
  * Home Directory
  * mkdir / rmdir
  * cd / cd .. / cd - / cd ~
  * touch
  * file
  * Reuse previous commands
  * Using TAB for completion
  * Relative / Absolute Addresses
  * Redirection: send output to a file or read a file as standard input to a command >
  * echo "string" > filename
  * rm -i -rf
  * cp -i -rv
  * mv -i
  * alias / unalias
  * wild cards * ?
  * cat / more / less
  * head / tail -f
  * ln -s
  * man
  * Shell Variables (SHELL, HOME, PATH)
  * which / type / enable -a
  * find
  * locate / updatedb
  * grep
  * ps -A / kill / killall
  * Piping: pass standard output as standard input to another command
  * chown , /etc/passwd
  * chmod
  * date, cal / unix timestamp
  * uptime / free

### Editing text files: vi

  * Command mode(ESC)
  * Insert mode(i)
  * Command line mode(:)
  * :w :q :wq :q! :w filename
  * copy/cut/paste/visual y d p v
  * search forward/backward
  * h j k l $ 0 G x o A

### Compression

  * tar zcvf file.tar.gz directory
  * tar xf file.tar.gz
  * gzip / gunzip / zcat / zless / zgrep
  * tar jcf file.tar.bz directory
  * tar xf file.tar.bz
  * bzip2 / bunzip2 / bzcat / bzless / bzgrep
  * tar Jcf file.tar.xz directory
  * tar xf file.tar.xz
  * xz / unxz / xzcat / xzless / xzgrep

### Network Settings

  * ip address add 192.168.10.100/24 dev ens192
  * ip address show
  * ip -br -c a s
  * ifconfig
  * ip route add default via 192.168.10.1
  * ip route del default
  * ip route show
  * ip  -c r s
  * route -n
  * ping
  * /etc/network/interfaces


<code>
auto lo
iface lo inet loopback

auto ens192
iface ens192 inet static
    address 192.168.10.100/24
    gateway 192.168.10.1

iface ens192 inet6 static
    address 2a0e:0:1:b:109::/64
    gateway 2a0e:0:1:b::1

• /etc/resolv.conf

nameserver 85.15.1.14
nameserver 85.15.1.15

### Package Management

• /etc/apt/sources.list

    deb http://deb.debian.org/debian bullseye main contrib non-free
    deb http://deb.debian.org/debian bullseye-updates main contrib non-free
    deb http://deb.debian.org/debian bullseye-backports main contrib non-free
    deb http://security.debian.org/debian-security bullseye-security main contrib non-free
    deb-src http://deb.debian.org/debian bullseye main contrib non-free
    deb-src http://deb.debian.org/debian bullseye-updates main contrib non-free
    deb-src http://deb.debian.org/debian bullseye-backports main contrib non-free
    deb-src http://security.debian.org/debian-security bullseye-security main contrib non-free

• apt update
• apt upgrade
• apt install tree
• apt search speedometer

</code>