linux-lec.org

lec-linux

lec 1 (command line essentials)

pwd

• prints working directory

cd

• changes directories

  cd / # navigato to the start of the harddisk
  cd /usr/share # example
  cd savolla # no absolute path using tab tab
  cd ./lib # . means current directory
  
  # navigating to home 3 ways
  cd /home/savolla #
  cd ~/savolla # if you are lazy
  cd # if you are ultra lazy
  
  cd ../ # go one level up. go backward
  cd ../../../etc # go 3 levels back and press tab tab
      

• summary

  pwd # prints current directory
  cd ../ # goes backward
  cd ./ # means current directory
  cd / # means go to the very beginning like C:\\ in windows
  
      

ls

• what’s the point if we just navigate accross the file system but can’t do anything?

  ls # lists content of the current directory
  ls -l # lists more information
  ls -l ~/Documents # list directories without leaving the current directory
      

lec 2 (file permissions)

• edit one file from /etc/hostname
• show that they can’t change the file
• ls -l /etc/hostname to show the privilages
• tell them about root user

sudo

sudo <command> # runs as super user
sudo vim /etc/hostname

whoami

whoami # shows the current user

su

• what if we don’t want to use sudo everytime

  su root # switch to the super user (root)
  whoami # show who am i
  vim /etc/hostname
  
  su nick # switch back to my user account way 1
  exit # switch back to my user account way 2
      

lec 3 (software installation)

• tell about package managers

  sudo apt-get install <program name> # ubuntu
  sudo yum install <program name> # centos:
  sudo pacman -S <program name> # arch
      

yum install ranger # install ranger

• talk about dependencies
• talk about repositories and tell that different distros have different repositories and different programs
• if I don’t like the program I can remove it

  sudo apt-get remove <program name> # ubuntu
  sudo yum remove <program name> # centos:
  sudo pacman -Rs <program name> # arch
      

lec 4 (other commands)

• talk about user permissions

chown

chown user:group <file>
chown -R user:group <file>

chmod

chmod u+rx

rm

mkdir

grep

awk

vim

bash scripting