l3h dec20

##### CENTOS
[student@lin3hcent ~]$ history
    1  ls
    2  history
    3  ls /root
    4  sudo ls /root
    5  sudo -i
    6  su -
    7  vim countdown
    8  countdown 12
    9  ./countdown 12
   10  chmod +x countdown
   11  ./countdown 12
   12  vim /etc/hosts
   13  ls -l /etc/hosts
   14  id
   15  sudo vim /etc/hosts
   16  cat /etc/hosts
   17  nano
   18  sudo vim /etc/hosts
   19  sudo visudo
   20  echo $EDITOR
   21  export EDITOR=/usr/bin/vim
   22  visudo
   23  export EDITOR=/usr/bin/nano
   24  sudo visudo
   25  env
   26  history
   27  ls -l countdown
   28  chmod -x countdown
   29  ls -l countdown
   30  ./countdown
   31  chmod +x countdown
   32  ls -l countdown
   33  countdown
   34  echo $PATH
   35  export PATH=$PATH:/home/student
   36  echo $PATH
   37  countdown
   38  echo $PATH
   39  countdown
   40  ls /etc/profile
   41  ls .bash_profile
   42  vim .bash_profile
   43  echo $PATH
   44  cp countdown /usr/local/bin
   45  ls -ld /usr/local/bin
   46  sudo cp countdown /usr/local/bin
   47  vim countdown
   48  git
   49  sudo dnf install git
   50  git clone https://github.com/sandervanvugt/linuxin3hours
   51  cd linuxin3hours/
   52  ls
   53  cd
   54  pwd
   55  echo $USER
   56  cd /usr
   57  ls
   58  ls bin
   59  ls sbin
   60  fsck
   61  which fsck
   62  cd /etc
   63  ls
   64  cat passwd
   65  cat shadow
   66  sudo cat shadow
   67  ls -l shadow
   68  cd
   69  man hier
   70  countdown 10
   71  history
   72  systemctl edit sshd
   73  sudo -i
   74  sudo vim /etc/bashrc
   75  man sudo
   76  man ls
   77  man -k user
   78  man -k user | wc
   79  man man
   80  man -k user | grep 8
   81  man -k sander
   82  sudo mandb
   83  man ls
   84  pinfo '(coreutils) ls invocation'
   85  sudo mandb
   86  man -k user
   87  sudo dnf install openssh-server
   88  sudo systemctl status sshd
   89  sudo systemctl disable sshd --now
   90  sudo systemctl status sshd
   91  sudo systemctl enable sshd --now
   92  sudo systemctl status sshd
   93  sudo systemctl list-unit-files
   94  ssh 192.168.4.44
   95  lsblk
   96  sudo umount /dev/sdb1
   97  sudo /dev/sdb1 /mnt
   98  sudo mount /dev/sdb1 /mnt
   99  history

### UBUNTU 1  id
    2  sudo visudo
    3  export EDITOR=/usr/bin/vim
    4  sudo visudo
    5  sudo apt install openssh-server
    6  dpkg -S $(which sshd)
    7  which sshd
    8  history
    9  cat /etc/apt/sources.list
   10  ps aux
   11  ps aux | wc
   12  ps aux | grep ssh
   13  systemctl status sshd
   14  sudo systemctl disable --now sshd
   15  systemctl status sshd
   16  systemctl enable --now sshd
   17  sudo apt install openssh-server
   18  sudo systemctl list-unit-files | grep sshd
   19  sudo systemctl list-unit-files
   20  systemctl apt remove openssh-server
   21  sudo apt remove openssh-server
   22  which sshd
   23  sudo apt install openssh-server
   24  sudo systemctl status openssh-servier
   25  sudo systemctl status sshd
   26  sudo systemctl status ssh
   27  sudo systemctl enable ssh
   28  sudo systemctl status ssh
   29  sudo systemctl disable --now ssh
   30  sudo systemctl status ssh
   31  sudo systemctl enable --now ssh
   32  dd if=/dev/zero of=/dev/null &
   33  top
   34  killall dd
   35  ip addr show
   36  sudo ufw status
   37  history