LFCS day1 feb2022

#### on UBUNTU
student@student-virtual-machine:~$ history
    1  sudo useradd -s /bin/bash -m anna
    2  #echo Defaults timestamp_type=global,timestamp_timeout=240
    3  sudo ls -a /root
    4  sudo visudo
    5  man 5 sudoers
    6  sudo useradd -s /bin/bash -m linda
    7  sudo useradd -s /bin/bash -m lisa
    8  visudo
    9  sudo visudo
   10  sudo passwd lisa
   11  su - lisa
   12  su - anna
   13  sudo passwd anna
   14  su - anna
   15  sudo visudo
   16  history
   17  history -w
   18  sudo useradd -s /bin/bash -m anna
   19  #echo Defaults timestamp_type=global,timestamp_timeout=240
   20  sudo ls -a /root
   21  sudo visudo
   22  man 5 sudoers
   23  sudo useradd -s /bin/bash -m linda
   24  sudo useradd -s /bin/bash -m lisa
   25  visudo
   26  sudo visudo
   27  sudo passwd lisa
   28  su - lisa
   29  su - anna
   30  sudo passwd anna
   31  su - anna
   32  sudo visudo
   33  history
   34  history -w
   35  exit
   36  history
   37  sudo apt install openssh-server
   38  sudo apt install finger
   39  sudo apt-cache search seinfo
   40  tail -5 /etc/passwd
   41  useradd --help | less
   42  useradd -m -s /bin/bash -c "some user" linda
   43  sudo useradd -m -s /bin/bash -c "some user" linda
   44  finger linda
   45  history
   46  ip a
   47  exit

##### ON CENTOS9
v/loop0p1         246M   15K  234M   1% /loop0
tmpfs                389M  104K  389M   1% /run/user/1000
/dev/sr0             7.9G  7.9G     0 100% /run/media/student/CentOS-Stream-9-BaseOS-x86_64
[root@localhost ~]# history
    1  find / -name "hosts"
    2  find / -name "*hosts*"
    3  locate hosts
    4  history
    5  updatedb
    6  locate hosts
    7  touch sander
    8  locate sander
    9  find / -name "sander"
   10  find / -user student
   11  find / -user student | wc
   12  w
   13  useradd linda
   14  find / -user linda
   15  find / -user linda -exec cp {} /root/linda/ \;
   16  mkdir /root/linda ; find / -user linda -exec cp {} /root/linda/ \;
   17  ls -a linda
   18  ls -l
   19  cd linda
   20  ls -l
   21  -a
   22  ls -a
   23  find / -perm /4000
   24  man find
   25  find / -type f -size +100M
   26  mkdir -p find/content; find /etc -exec grep -l student {} \; -exec cp {} find/content/ \; 2>/dev/null
   27  ls
   28  tree find/
   29  find /etc/ -name '*' -type f | xargs grep '127.0.0.1'
   30  vim /etc/dummy
   31  find /etc/ -name '*' -type f | xargs grep '127.0.0.1'
   32  find /etc/ -name '*' -type f | xargs grep '127\.0\.0\.1'
   33  cd
   34  vim countdown
   35  history
   36  bash countdown 13
   37  sed -n 5p /etc/passwd
   38  vim myfile
   39  sed -i 's/old/new/' myfile
   40  cat myfile
   41  sed -i 's/old/new/g' myfile
   42  cat myfile
   43  sed -i -e '2d' myfile
   44  cat myfile
   45  awk -F : '{ print $4 }' /etc/passwd
   46  awk -F : '/linda/ { print $3 }' /etc/passwd
   47  man awk
   48  pinfo awk
   49  last
   50  which last
   51  ls -l /bin/last
   52  vim /etc/login.defs
   53  cd /etc/skel/
   54  ls -al
   55  echo hello > hello
   56  pwd
   57  useradd -m -s /bin/bash bob
   58  cd /home/bob
   59  ls -al
   60  ls -ld .
   61  passwd -S bob
   62  chage -l bob
   63  id bob
   64  tail /etc/passwd
   65  man 5 passwd
   66  finger bob
   67  usermod -s /usr/bin/passwd bob
   68  tail -1 /etc/passwd
   69  passwd bob
   70  su - bob
   71  password
   72  finger
   73  yum provides */finger
   74  yum install -y epel-release
   75  ssh [email protected]
   76  cd
   77  countdown 12
   78  ./countdown 12
   79  bash countdown 12
   80  useradd -G wheel -s /usr/bin/passwd anna
   81  chage anna
   82  grep anna /etc/passwd /etc/shadow /etc/group
   83  passwd --help
   84  usermod -s /bin/bash anna
   85  passwd anna
   86  passwd -e anna
   87  su - anna
   88  su - student
   89  ssh [email protected]
   90  #make sure the following is entered after doing visudo: Defaults timestamp_type=global,timestamp_timeout=240
   91  history
   92  history -d 90
   93  history
   94  touch myfile
   95  ls -l myfile
   96  chattr +i myfile
   97  rm -f myfile
   98  lsattr myfile
   99  chattr -i myfile
  100  lsattr myfile
  101  rm myfile
  102  ls
  103  countdown
  104  echo $PATH
  105  ./countdown
  106  ls -l
  107  chmod +x countdown
  108  ./countdown
  109  cd /home/linda
  110  touch wortel
  111  su - linda
  112  cd
  113  groupadd sales
  114  groupadd account
  115  usermod -aG sales linda
  116  usermod -aG sales lisa
  117  useradd -G sales lisa
  118  usermod -aG account anna
  119  useradd -G account anouk
  120  grep -E {account|sales} /etc/group
  121  grep -E '{account|sales}' /etc/group
  122  tail -2 /etc/group
  123  tail -10 /etc/group
  124  mkdir -p /data/account /data/sales
  125  cd /data
  126  ls -l
  127  chmod 770 *
  128  ls -l
  129  chgrp account account
  130  chgrp sales sales
  131  ls -l
  132  id anna
  133  usermod -G sales anna
  134  id anna
  135  usermod -aG account,wheel anna
  136  id anna
  137  usermod -G account,wheel anna
  138  su - anna
  139  su - anouk
  140  chmod +t *
  141  chmod g+s *
  142  ls -l
  143  su - anna
  144  su - anoukt
  145  su - anouk
  146  history
  147  cd
  148  ./countdown 21
  149  ls -l /data
  150  man chattr
  151  umask
  152  cd /etc
  153  grep -R 'umask' *
  154  vim bashrc
  155  cd skel/
  156  ls -a
  157  vim .bashrc
  158  awk -F : ' $3 > 1000 { print $1 }'
  159  awk -F : ' $3 > 1000 { print $1 }' /etc/passwd
  160  which passwd
  161  ls -l $(which passwd)
  162  for i in $(awk -F : ' $3 > 1000 { print $1 }' /etc/passwd); echo $i; done
  163  for i in $(awk -F : ' $3 > 1000 { print $1 }' /etc/passwd); do echo $i; done
  164  for i in $(awk -F : ' $3 > 1000 { print $1 }' /etc/passwd); do cp .bashrc /home/$i/; done
  165  for i in $(awk -F : ' $3 > 1000 { print $1 }' /etc/passwd); do cp -f .bashrc /home/$i/; done
  166  su - anna
  167  su - anouk
  168  cd
  169  cd /data
  170  ls -l
  171  su - linda
  172  history
  173  ls -l `which ls`
  174  ls -l `which passwd`
  175  ls -l $(which passwd)
  176  df -h
  177  poweroff
  178  setenforce 0
  179  su - linda
  180  setenforce
  181  setenforce 1
  182  su - linda
  183  exit
  184  cat /etc/passwd
  185  su - anouk
  186  lsblk
  187  df -h
  188  dd if=/dev/zero of=/diskfile.img bs=1M count=1024
  189  dd if=/dev/zero of=/diskfile2.img bs=1M count=1024
  190  losetup -fP /diskfile.img
  191  losetup -fP /diskfile2.img
  192  losetup -a
  193  lsblk
  194  ./countdown 12
  195  history
  196  lsblk
  197  fdisk /dev/loop0
  198  mkfs.ext2 /dev/loop0p1
  199  lsblk
  200  mount /dev/loop0p1 /mnt
  201  cd /mnt
  202  touch loop1file
  203  ls -kl
  204  cd
  205  umount /mnt
  206  ls /mnt
  207  vim /etc/fstab
  208  mount -a
  209  mkdir /loop0
  210  mount -a
  211  mount
  212  ls /loop0
  213  reboot
  214  losetup -a
  215  losetup -fP diskfile.img
  216  losetup -fP /diskfile.img
  217  lsblk
  218  mount -a
  219  mount
  220  tail -1 /etc/fstab
  221  su - anouk
  222  su - anna
  223  su - anouk
  224  su - anna
  225  history
  226  df -h
  227  history