linden day1 feb21

[student@centos2 ~]$ cat countdown
#!/bin/bash

COUNTER=$1
COUNTER=$(( COUNTER * 60 ))

while true
do
	echo $COUNTER seconds remaining in break
	sleep 1
	COUNTER=$(( COUNTER - 1 ))
done

#########[student@centos2 ~]$ history
    1  whoami
    2  ls
    3  ls -l
    4  cd desktop
    5  cd Desktop/
    6  ls
    7  cd ..
    8  chvt 3
    9  sudo chvt 3
   10  history
   11  ls
   12  useradd linda
   13  sudo useradd linda
   14  sudo passwd linda
   15  su - linda
   16  id
   17  sudo usermod -aG wheel linda
   18  id linda
   19  sudo visudo
   20  history
   21  su - linda
   22  sudo apt install vim
   23  sudo dnf install vim
   24  sudo yum install vim
   25  vim countdown
   26  countdown 12
   27  ./countdown 12
   28  ls -l countdown
   29  chmod +x countdown
   30  ./countdown 12
   31  vimtutor
   32  ./countdown 13
   33  history
   34  nano countdown
   35  vim countdown
   36  history
   37  echo $PATH
   38  cp countdown /usr/local/bin/
   39  sudo cp countdown /usr/local/bin/
   40  countdown 0
   41  history
   42  cat countdown
   43  ip a
   44  sudo nmtui
   45  ip a
   46  sudo apt install openssh-server
   47  sudo systemctl status openssh-server
   48  sudo systemctl status sshd
   49  ip a
   50  chsh --help
   51  chsh -l
   52  whoami
   53  w
   54  hostname
   55  date
   56  date --help | less
   57  date --help
   58  date --help | less
   59  uname
   60  uname --help
   61  uname --all
   62  passwd
   63  touch mynewfile
   64  cd /usr
   65  touch newfile
   66  cd
   67  ls -l
   68  touch countdown
   69  ls -l countdown
   70  last
   71  countdown 12
   72  man useradd
   73  man semanage-fcontext
   74  man -k user
   75  man man
   76  man apropos
   77  man mandb
   78  man man
   79  sudo mandb
   80  man -k user
   81  man -k user | wc
   82  man -k user
   83  man -k user | grep 8
   84  man -k user | grep 8 | wc
   85  history
   86  man uname
   87  man 2 uname
   88  man -a uname
   89  man passwd
   90  man 5 passwd
   91  man ls
   92  pinfo '(coreutils) ls invocation'
   93  info '(coreutils) ls invocation'
   94  cd /etc
   95  ls -l
   96  ls | wc
   97  ls
   98  ls -l grub2.cfg
   99  history
  100  ls -lrt
  101  cat shadow
  102  sudo cat shadow
  103  echo $PATH
  104  cd
  105  ls
  106  ls -a
  107  echo hello > .hello
  108  ls
  109  ls -a
  110  cat .hello
  111  cd /etc
  112  ls
  113  ls a*
  114  ls -d a*
  115  ls -d a*/b*
  116  ls -d a*/*
  117  ls -d a*/a*
  118  ls a?????
  119  ls ?????
  120  ls -d ?????
  121  ls -d g????
  122  ls ??a* -d
  123  ls ??[ab]* -d
  124  ls ??[a-e]* -d
  125  ls -d a*
  126  ls a* -d
  127  cd
  128  mkdir blah
  129  cp /etc/hosts blah/
  130  rmdir blah
  131  rm -rf blah/
  132  history
[student@centos