linux in 3 hours oct23

CENtOS COMMANDS
[student@localhost ~]$ history
    1  whoami
    2  sudo -i
    3  ls -l
    4  ls -l /root
    5  sudo ls -l /root
    6  nano countdown
    7  countdown
    8  ./countdown
    9  ls -l countdown
   10  chmod +x countdown
   11  ./countdown 12
   12  sudo ls -l /root
   13  ls -l /root
   14  sudo -i
   15  echo $SHELL
   16  cat countdown
   17  echo hello
   18  echo $SHELL
   19  echo countdown
   20  cat countdown
   21  less countdown
   22  history
   23  countdown
   24  echo $PATH
   25  ./countdown
   26  ls -l countdown
   27  pwd
   28  countdown
   29  cp countdown /usr/local/bin/
   30  ls -ld /usr/local/bin
   31  sudo cp countdown /usr/local/bin/
   32  countdown
   33  cat countdown
   34  countdown
   35  ls -ld /usr/local/bin
   36  ls -l /usr/local/bin
   37  sudo dnf install git
   38  which git
   39  pwd
   40  history
   41  git clone https://github.com/sandervanvugt/linuxin3hours
   42  ls
   43  ls -l
   44  cd Linuxin3hours
   45  cd linuxin3hours
   46  pwd
   47  ls
   48  cd ..
   49  pwd
   50  cd /
   51  ls
   52  man hier
   53  echo $USER
   54  cd /home/$USER
   55  cd /tmp
   56  ls
   57  cd /
   58  ls -ld .
   59  ls -ld /tmp
   60  cd etc
   61  ls
   62  cat passwd
   63  cat shadow
   64  ls -l shadow
   65  sudo cat /etc/shadow
   66  ls -l shadow
   67  cd /etc
   68  cd
   69  countdown 12
   70  man useradd
   71  man -k user
   72  man -k user | grep 8
   73  man -k sander
   74  man man
   75  man apropos
   76  mandb
   77  sudo mandb
   78  useradd --help | less
   79  ssh 192.168.29.143
   80  lsblk
   81  sudo mount /dev/sdb1 /mnt
   82  lsblk
   83  cd /mnt
   84  ls
   85  touch hello
   86  ls -l
   87  cd
   88  sudo umount /mnt
   89  lsblk
   90  sudo umount /dev/sdb1
   91  history


UBUNTU COMMANDS
student@student-virtual-machine:~$ history
    1  sudo apt update
    2  sudo apt install openssh-server
    3  ps aux
    4  ps aux | grep ssh
    5  top
    6  systemctl status sshd
    7  systemctl stop sshd
    8  sudo systemctl stop sshd
    9  systemctl status sshd
   10  sudo systemctl start sshd
   11  systemctl status sshd
   12  sudo systemctl enable --now sshd
   13  sudo systemctl enable --now ssh
   14  pidof sshd
   15  ps aux | less
   16  sudo kill $(pidof sshd)
   17  systemctl status sshd
   18  sudo systemctl start sshd
   19  sudo systemctl list-units
   20  sudo systemctl list-unit-files -t service
   21  sudo top
   22  sudo dd if=/dev/zero of=/dev/null &
   23  sudo top
   24  history
   25  ip addr show
   26  ip a
   27  sudo ufw status
   28  exit
   29  history