##### USER COMMANDS
[student@localhost tmp]$ history
    1  vim countdown
    2  bash countdown 13
    3  vim countdown
    4  history
    5  countdown 13
    6  echo $PATH
    7  pwd
    8  cp countdown /usr/local/bin
    9  ./countdown 13
   10  ls -l
   11  chmod +x countdown
   12  ./countdown 13
   13  history
   14  sleep 15 ; cat countdown
   15  sudo useradd linda
   16  su -
   17  sudo useradd linda
   18  id
   19  w
   20  date
   21  history
   22  sudo useradd linda
   23  id linda
   24  sudo -i
   25  sudo passwd linda
   26  sudo su -
   27  su -
   28  history
   29  history -d 28
   30  history
   31  sudo visudo
   32  su - linda
   33  sudo visudo
   34  su - linda
   35  visudo
   36  sudo visudo
   37  sudo vim /etc/sudoers.d/linda
   38  echo $PATH
   39  sudo cp countdown /usr/bin/
   40  countdown 12
   41  vimtutor
   42  vim mynewfile
   43  ls
   44  ls -a
   45  cat .bash_history
   46  cat .bash_history | grep sudo
   47  sudo journalctl | grep sudo
   48  sudo ip addr show
   49  sudo ip a
   50  ip a
   51  systemctl status sshd
   52  firewall-cmd --list-all
   53  sudo systemctl disable --now sshd
   54  sudo systemctl status sshd
   55  sudo systemctl enable --now sshd
   56  sudo systemctl status sshd
   57  cd /
   58  ls
   59  cd /usr
   60  ls
   61  touch hello
   62  cd /tmp
   63  touch hello
   64  sudo -i
   65  history

### ROOT COMMANDS
[root@localhost ~]# history
    1  visudo
    2  id student
    3  usermod -aG wheel student
    4  id student
    5  exit
    6  journalctl
    7  exit
    8  cd /etc
    9  ls
   10  cd /proc
   11  ls
   12  touch hello
   13  less cpuinfo
   14  cd sys
   15  ls
   16  cd net
   17  ls
   18  cd ipv6
   19  ls
   20  cd cond
   21  ls
   22  cd conf
   23  ls
   24  cd all
   25  ls
   26  ip a
   27  echo 1 > disable_ipv6
   28  ip a
   29  pwd
   30  cd /dev
   31  ls
   32  cd
   33  echo 1 > muyfule
   34  cat muyfule
   35  cd /var
   36  ls
   37  cd log
   38  ls
   39  less /etc/passwd
   40  cd /dev
   41  ls
   42  ls -l
   43  cd
   44  man hier
   45  countdown 13
   46  cd /
   47  ls -l
   48  cd /bin
   49  ls
   50  pwd
   51  ls | wc
   52  cd /usr/bin
   53  ls | wc
   54  cd
   55  ls -il /etc/hosts
   56  cd /boot
   57  mount | grep ext4
   58  ls -il
   59  debugfs /boot
   60  debugfs /dev/sda1
   61  cd
   62  ls -il /etc/hosts
   63  ln /etc/hosts myhosts
   64  ls -il /etc/hosts myhosts
   65  echo hello >> /etc/hosts
   66  ls -il /etc/hosts myhosts
   67  ln -s /etc/hosts myshosts
   68  ls -il /etc/hosts myhosts myshosts
   69  cat myshosts
   70  rm /etc/hosts
   71  cat myhosts
   72  cat myshosts
   73  ls -il /etc/hosts myhosts myshosts
   74  ln myhosts /etc/hosts
   75  history
   76  ln /etc myetc
   77  ln -s /etc myetc
   78  ln /boot/vmlinuz-4.18.0-193.el8.x86_64 mykernel
   79  ln -s /boot/vmlinuz-4.18.0-193.el8.x86_64 mykernel
   80  history
   81  mount
   82  mount | grep '^/'
   83  cd /boot
   84  ls
   85  cd /
   86  umount /dev/sda1
   87  cd boot
   88  ls
   89  cd ..
   90  mount /dev/sda1 /boot
   91  ls
   92  cd boot
   93  ls
   94  mount /dev/sdb1 /mnt
   95  man -k user
   96  man man
   97  man apropos
   98  mandb
   99  man -k user
  100  man -k user | wc
  101  man man
  102  man -k user | grep 8
  103  man -k user | grep 8 | wc
  104  man useradd
  105  man ls
  106  info '(coreutils) ls invocation'
  107  find / -name "hosts"
  108  find / -name "*hosts*"
  109  find / -user linda
  110  find / -size +106M
  111  find / -size +106M 2>/dev/null
  112  exit
  113  history