linfun day1 june21

######## commands to prepare ssh server on ubuntu
student@student-virtual-machine:~$ history
    1  ip a
    2  ip addr show
    3  apt install openssh-server
    4  sudo apt install openssh-server
    5  sudo systemctl status sshd
    6  history


#############Rocky Linux commands    1  vim countdown
    2  cat countdown
    3  countdown 12
    4  ./countdown 12
    5  ls -l
    6  chmod +x countdown
    7  ./countdown 13
    8  history
    9  vimtutor
   10  vim countdown
   11  echo $PATH
   12  pwd
   13  countdown 12
   14  ./countdown 4
   15  ls -l
   16  chmod -x countdown
   17  ls -l
   18  chmod +x countdown
   19  ls -l
   20  echo $PATH
   21  pwd
   22  cp countdown /usr/local/bin/
   23  whoami
   24  ls -ld /usr/local/bin/
   25  sudo cp countdown /usr/local/bin/
   26  id
   27  history
   28  sudo -i
   29  su -
   30  sudo -i
   31  su -
   32  useradd linda
   33  sudo useradd linda
   34  sudo passwd linda
   35  su - linda
   36  usermod -aG wheel linda
   37  sudo usermod -aG wheel linda
   38  su - linda
   39  history
   40  cat countdown
   41  echo $(( 2 * 5 ))
   42  whoami
   43  IAM=$(whoami)
   44  echo $IAM
   45  sudo visudo
   46  sudo useradd lisa
   47  sudo passwd lisa
   48  su - lisa
   49  echo $HISTSIZE
   50  echo $HISTFILESIZE
   51  sudo visudo
   52  su - lisa
   53  countdown 12
   54  sudo visudo
   55  ssh student@192.168.29.108
   56  rpm -qa | grep ssh
   57  ssh student@192.168.29.108
   58  ssh-keygen
   59  ssh-copy-id 192.168.29.108
   60  ssh 192.168.29.108
   61  history
   62  whoami
   63  echo $PS1
   64  whoami -h
   65  whoami --help
   66  hostname
   67  hostname --help
   68  hostname --help | less
   69  date
   70  date +%d-%m-%Y
   71  uname
   72  uname --help
   73  uname -a
   74  uname -r
   75  touch hello
   76  ls -l
   77  cd /
   78  touch hello
   79  cd
   80  last
   81  history
   82  countdown 12
   83  man passwd
   84  man semanage-fcontext
   85  man man
   86  man 5 passwd
   87  man -k user
   88  man man
   89  man apropos
   90  man mandb
   91  sudo mandb
   92  man -k user
   93  man -k user | wc
   94  man -k user | grep 8
   95  man ls
   96  pinfo '(coreutils) ls invocation'
   97  pinfo
   98  cd /usr/share/doc/
   99  ls
  100  cd pam/
  101  ls
  102  less Linux-PAM_SAG.txt
  103  vimtutor
  104  cd
  105  pwd
  106  ls l
  107  ls -l
  108  ls -a
  109  touch hidden .hidden
  110  ls -a
  111  ls
  112  ls -lrt
  113  cd /etc
  114  ls -lrt
  115  cd
  116  ls -l /tmp
  117  ls -ld /tmp
  118  cd /etc
  119  ls *
  120  ls -d *
  121  ls -d a*
  122  ls -d [a-c]*
  123  ls -d ?[a-c]*
  124  cd
  125  mkdir myrandomfilesthatidontlikeverymuchbutwhichiwanttouseinthiscoursetomakesomedemosthatmakesense
  126  ls
  127  mv h* myrandomfilesthatidontlikeverymuchbutwhichiwanttouseinthiscoursetomakesomedemosthatmakesense/
  128  ls myrandomfilesthatidontlikeverymuchbutwhichiwanttouseinthiscoursetomakesomedemosthatmakesense/
  129  rmdir myrandomfilesthatidontlikeverymuchbutwhichiwanttouseinthiscoursetomakesomedemosthatmakesense/
  130  rm -rf myrandomfilesthatidontlikeverymuchbutwhichiwanttouseinthiscoursetomakesomedemosthatmakesense/
  131  ls
  132  sudo rm -rf / myrandomfilesthatidontlikeverymuchbutwhichiwanttouseinthiscoursetomakesomedemosthatmakesense
  133  man hier
  134  man file-hierarchy