linfun aug23 day1

[student@centos tmp]$ history
    1  cat /etc/os-release
    2  exit
    3  vim countdown
    4  countdown
    5  echo $PATH
    6  ./countdown
    7  ls -l countdown
    8  chmod +x countdown
    9  ./countdown
   10  cat countdown
   11  history
   12  cat countdown
   13  whoami
   14  ls -l /root
   15  sudo ls -l /root
   16  rm -rf /root/*
   17  id
   18  cat /etc/group
   19  cut -d : -f 1 /etc/group
   20  tail -5 /etc/group
   21  cut -d : -f 1 /etc/group
   22  dnf install openssh
   23  sudo dnf install openssh
   24  sudo systemctl status sshd
   25  ip a
   26  ssh student@192.168.29.146
   27  history
   28  ssh localhost
   29  history
   30  ls
   31  LS
   32  ls --help
   33  ls --help | less
   34  ls -lrt
   35  whoami
   36  whoami --help
   37  id -un
   38  id
   39  hostname
   40  hostnamectl --help
   41  hostnamectl status
   42  hostnamectl hostname centos.example.com
   43  hostnamectl status
   44  date
   45  date +%d-%m-%y
   46  timedatactl
   47  timedatectl
   48  timedatectl --help
   49  timedatectl show
   50  timedatectl status
   51  uname
   52  uname --help
   53  uname -r
   54  uname -a
   55  hostnamectl status
   56  history
   57  passwd
   58  sudo passwd root
   59  touch hello
   60  ls -lrt
   61  touch /hello
   62  touch countdown
   63  ls -l
   64  last
   65  man passwd
   66  sudo passwd bob
   67  echo $?
   68  man passwd
   69  passwd --help
   70  man passwd
   71  man man
   72  man lvcreate
   73  man -k user
   74  man -k user |wc
   75  man -k user | grep 8
   76  man -k sander
   77  man man
   78  man apropos
   79  man mandb
   80  sudo mandb
   81  man ls
   82  pinfo '(coreutils) ls invocation'
   83  cd /usr/share/doc
   84  ls
   85  cd passwd/
   86  ls
   87  cd ../PackageKit/
   88  ls
   89  exit
   90  history
   91  man -k hostname
   92  man man
   93  man hostnamectl
   94  lvcreate --help
   95  lvcreate --help | less
   96  pwd
   97  ls
   98  ls -a
   99  ls -ld /etc
  100  ls -l /etc
  101  ls -l /etc/sudo*
  102  sudo ls -l /etc/sudo*
  103  sudo ls -ld /etc/sudo*
  104  cd /etc
  105  ls a
  106  ls a*
  107  ls -d a*
  108  ls -d a?[np]*
  109  cd
  110  pwd
  111  cd /etc
  112  mkdir new
  113  cd /tmp
  114  mkdir new
  115  rmdir
  116  rmdir new
  117  mkdir new
  118  touch new/file
  119  ls new
  120  rmdir new
  121  rm -rf new/
  122  touch new/file
  123  mkdir new
  124  touch new/file
  125  man hier
  126  pwd
  127  cd home
  128  cd /home
  129  pwd
  130  touch hello
  131  ls
  132  cd
  133  touch hello
  134  cd /var
  135  ls -l /var/log/messages
  136  ls -l log/messages
  137  cd tmp
  138  pwd
  139  ls -l log/messages
  140  ls -l ../log/messages
  141  ls -l ../../var/log/messages
  142  pwd
  143  cp /var/log/messages newdir
  144  sudo cp /var/log/messages newdir
  145  ls -ld newdir
  146  sudo rm newdir
  147  sudo cp /var/log/messages newdir/
  148  cp -a ~/.* .
  149  ls -a
  150  cp /etc/hosts .
  151  ls
  152  mv hosts whatever
  153  ls
  154  mv whatever ~/hosts
  155  ls
  156  ls ~
  157  history