bash4h jun21

[student@localhost ~]$ history
    1  env
    2  echo $PATH
    3  key=value
    4  echo $key
    5  echo ${key}1
    6  echo $key1
    7  KEY=another
    8  echo $KEY
    9  echo $key
   10  env
   11  ls
   12  echo $?
   13  ls uhkuh
   14  echo $?
   15  sudo yum install git vim bash-completion curl wget -y
   16  git clone https://github.com/sandervanvugt/bash-scripting
   17  cd bash-scripting/
   18  ls
   19  vim hello-world
   20  history
   21  ls
   22  echo $PATH
   23  hello-world
   24  ./hello-world
   25  ls -l hello-world
   26  chmod +x hello-world
   27  ./hello-world
   28  history
   29  bash hello-world
   30  history
   31  sudo cp hello-world /usr/local/bin
   32  hello-world
   33  ehco the current $SHELL is $SHELL
   34  echo the current $SHELL is $SHELL
   35  echo the current '$SHELL' is $SHELL
   36  echo the current \$SHELL is $SHELL
   37  whoami
   38  echo `whoami`
   39  echo $(whoami)
   40  declare -r BLAH=yes
   41  echo $BLAH
   42  BLAH=no
   43  color=red
   44  echo $color
   45  echo "$color"
   46  echo ${color}
   47  vim readi
   48  ls
   49  vim readtit
   50  chmod +x readtit
   51  ./readtit
   52  cat readtit
   53  pwd
   54  ./readtit
   55  . readtit
   56  pwd
   57  source readtit
   58  cd -
   59  source readtit
   60  cd -
   61  vim mycolor
   62  chmod +x mycolor
   63  ./mycolor
   64  sudo -i
   65  ./mycolor
   66  cat mycolor
   67  cat /etc/sysconfig/colors
   68  sudo yum install network-scripts
   69  vim /etc/init.d/network
   70  ls
   71  ./countdown 12
   72  ls
   73  chmod +x script*
   74  vim script3
   75  ./script3 a b c d e f g h i j k l m
   76  cat script3
   77  vim script4
   78  ./script4 a b c d e
   79  date +%d-%m-%y
   80  TODAY=$(date +%d-%m-%Y)
   81  echo $TODAY
   82  cd /lib
   83  ls
   84  cd /lib64
   85  ls
   86  cd /usr/lib
   87  ls
   88  cd /usr/lib64
   89  ls
   90  cd
   91  uname -r
   92  find / -type d -n $(uname -r)
   93  find / -type d -name $(uname -r)
   94  cd /usr/lib/modules
   95  ls
   96  cd `uname -r`
   97  cd -
   98  cd $(uname -r)
   99  cd
  100  cd bash-scripting/
  101  ls
  102  vim setupftp
  103  ./setupftp
  104  ls
  105  ls -l hosts
  106  vim kube-setup.sh
  107  grep '<<' *
  108  vim setupftp
  109  vim script10
  110  echo $((1+1))
  111  echo $(( 1+1 ))
  112  vim script10
  113  ./script10 5
  114  cat psubst1
  115  vim psubst1
  116  ./psubst1
  117  vim psubst2
  118  ./psubst2
  119  ./psubst3
  120  vim psubst3
  121  cat psubst4
  122  ./psubst4
  123  ./psubst4 hello
  124  vim misvar
  125  chmod +xmisvar
  126  chmod +x misvar
  127  ./misvar
  128  vim misvar
  129  ./misvar
  130  echo $?
  131  vim psubst4
  132  ./psubst4
  133  vim psubst4
  134  ./script10 12
  135  vim script10
  136  ./script10 12
  137  vim script6
  138  ./script6 /usr/bin/blah
  139  vim script6
  140  ./script6
  141  ./script6 /usr/bin/blah
  142  vim pm
  143  ./pm
  144  vim script10
  145  vim script7
  146  man here
  147  ./pm
  148  vim pm
  149  ./pm
  150  vim patternglob
  151  ./patternglob
  152  touch zblah.txt
  153  ./patternglob
  154  vim removepattern
  155  ./removepattern
  156  ls
  157  vim removepattern
  158  vim countdown
  159  ./countdown 1
  160  echo "12/5" | bc
  161  echo "12/5" | bc -l
  162  man bc
  163  man test
  164  [ -f /etc/hosts ] && echo exists
  165  [ -f /etc/hosts ] || echo exists
  166  if [ -f /etc/hosts ]; then echo exists; fi
  167  if test -f /etc/hosts; then echo exists; fi
  168  [ -d /etc/hosts ] || [ -f /etc/hosts ] && echo exists
  169  [ -d /etc/hosts ] || ( [ -f /etc/hosts ] && echo exists )
  170  if useradd bob; then cp /etc/hosts /home/bob; fi
  171  true
  172  echo $?
  173  [ -d /etc/hosts ] && echo yes || echo no
  174  [ -d /etc/hosts ] || echo not && echo yes
  175  vim /etc/init.d/network
  176  ./countdown 12
  177  ls
  178  chmod +x else*
  179  vim else1
  180  vim else2
  181  ./else2 /etc
  182  ./else2 /etc/hosts
  183  vim numcheck
  184  ./numcheck
  185  vim for
  186  vim case
  187  echo hello | tr [:lower:] [:upper:]
  188  echo hello | tr [a-z] [A-Z]
  189  echo hello | tr [a-z] [z-a]
  190  echo hello | tr [a-m] [n-z]
  191  vim case
  192  ./case
  193  vim case
  194  ./case
  195  vim case
  196  vim /etc/init.d/network
  197  vim script10
  198  vim case
  199  vim backout
  200  df /etc
  201  vim backout
  202  ./backout
  203  sudo ./backout
  204  vim backout
  205  sudo ./backout
  206  ls /etc.backup/
  207  vim convert
  208  mkdir mydir
  209  cd mydir/
  210  touch abc aBc ABC
  211  ../convert
  212  ls
  213  cd ..
  214  vim convert
  215  ls
  216  vim reboot-test.sh
  217  sudo reboot-test.sh
  218  sudo ./reboot-test.sh
  219  history