RHCSA jul20 day1

### from visual
linda   ALL=/usr/sbin/useradd, /usr/sbin/usermod, /usr/bin/passwd, ! /usr/bin/passwd root

#### commands
[root@localhost ~]# history
    1  vimtutor
    2  vim countdown
    3  countdown 12
    4  echo $PATH
    5  ./countdown 12
    6  ls -l countdown
    7  chmod +x countdown
    8  ./countdown 12
    9  exit
   10  visudo
   11  id student
   12  usermod -aG wheel student
   13  id student
   14  exit
   15  visudo
   16  useradd linda
   17  passwd linda
   18  su - linda
   19  visudo
   20  su - linda
   21  visudo
   22  vim /etc/sudoers.d/linda
   23  history
   24  systemctl isolate multi-user.target
   25  systemctl start graphical.target
   26  ip a
   27  systemctl status sshd
   28  firewall-cmd --list-all
   29  ./countdown 13
   30  ./countdown
   31  countdown
   32  echo $PATH
   33  cp countdown /usr/local/bin
   34  cd /
   35  ls -l
   36  man hier
   37  cd /etc
   38  ls
   39  cd
   40  vim countdown
   41  countdown 0
   42  ln /etc/hosts myhosts
   43  ls -il /etc/hosts myhosts
   44  echo 10.0.0.10 dummy >> myhosts
   45  ls -il /etc/hosts myhosts
   46  ln -s myhosts symhosts
   47  ls -il /etc/hosts myhosts symhosts
   48  cat symhosts myhosts /etc/hosts
   49  rm myhosts
   50  ls -il /etc/hosts myhosts symhosts
   51  cat symhosts
   52  ln /etc/hosts myhosts
   53  rm /etc/hosts
   54  cat myhosts
   55  ln myhosts /etc/hosts
   56  ln /boot/vmlinuz-4.18.0-193.el8.x86_64 kernel
   57  ln -s /boot/vmlinuz-4.18.0-193.el8.x86_64 kernel
   58  ln /etc myetc
   59  ln -s /etc myetc
   60  lsblk
   61  umount /dev/sdb1
   62  ls /mnt
   63  mount /dev/sdb1 /mnt
   64  ls /mnt
   65  cd /mnt
   66  ls
   67  umount /dev/sdb1
   68  lsof /mnt
   69  cd
   70  umount /dev/sdb1
   71  cd /boot
   72  ls
   73  cd
   74  ls
   75  rm myhosts
   76  find / -xtype l
   77  ls -l
   78  find / -xtype l | grep host
   79  find -P ./ -xtype l
   80  find / -xtype l -exec ls -l {} \;
   81  find / -xtype l -exec ls -l {} \; 2>/dev/null
   82  find / -name "hosts"
   83  find / -name "*hosts*"
   84  find / -size +100M > bigfiles.txt
   85  less bigfiles.txt
   86  find / -user linda
   87  ls -l /run/user/1000/
   88  ls -il /run/user/1000/
   89  ls -il /run/user/1000/gvfs
   90  echo $?
   91  history
   92  alias twaalf='countdown 12'
   93  twaalf
   94  man password
   95  man -k password
   96  man man
   97  man apropos
   98  mandb
   99  man -k password
  100  man -k password | wc
  101  man -k password | grep 1
  102  man passwd
  103  man -k authentication
  104  man -k user
  105  less /etc/passwd
  106  less /etc/shadow
  107  man passwd
  108  man 5 passwd
  109  man pwconv
  110  ls -l /etc/passwd
  111  ls -l /etc/shadow
  112  cat /etc/shadow
  113  id student
  114  grep student /etc/group
  115  grep student /etc/passwd
  116  id student
  117  vim /etc/login.defs
  118  useradd lisa
  119  passwd -l lisa
  120  passwd -u lisa
  121  passwd -L lisa
  122  chage lisa
  123  chage -L lisa
  124  chage -l lisa
  125  groups --help
  126  groups student
  127  history
  128  chage lisa
  129  chage --help
  130  groupadd account
  131  groupadd sales
  132  useradd -G account anna
  133  useradd -G account anouk
  134  id anna
  135  w
  136  id linda
  137  id lisa
  138  usermod -aG sales lisa
  139  usermod -aG sales linda
  140  id lisa
  141  usermod -G wheel lisa
  142  id lisa
  143  usermod -aG sales lisa
  144  usermod --help | less
  145  ls -l $(which useradd) $(which adduser)
  146  ls -l /etc/skel
  147  ls -al /etc/skel
  148  touch /etc/skel/blah
  149  useradd bill
  150  ls -la /home/bill
  151  history