collbash dec20

##### script 1 modification[root@localhost cool-bash]# cat 1_cpu-hog
#!/bin/bash
# Script that monitors the top-active process. The script sends an email to the user root if
# utilization of the top active process goed beyond 80%. Of course, this script can be tuned to
# do anything else in such a case.
#
# Start the script, and it will run forever.

while true
do
	# Check every 60 seconds if we have a process causing high CPU load
	sleep 5
	USAGE=`ps -eo pcpu,pid -o comm= | sort -k1 -n -r | head -1`
	CPU=$(echo $USAGE | awk '{ print $1 }')
	CPU=${CPU%.*}
	PID=$(echo $USAGE | awk '{ print $2 }')
	PNAME=$(echo $USAGE | awk '{ print $3 }')

	echo debugging...
	echo CPU is $CPU
	echo PID is $PID
	echo PNAME is $PNAME
	read

	# Only if we have a high CPU load on one process, run a check within 7 seconds
	# In this check, we should monitor if the process is still that active
	# If that's the case, root gets a message
	if [ $USAGE -gt 80 ]
	then
		USAGE1=$USAGE
		PID1=$PID
		PNAME1=$PNAME
		sleep 7
		USAGE2=`ps -eo pcpu,pid -o comm= | sort -k1 -n -r | head -1 | awk '{ print $1 } '`
		USAGE2=${USAGE2%.*}
		PID2=`ps -eo pcpu,pid -o comm= | sort -k1 -n -r | head -1 | awk '{print $2 }'`
		PNAME2=`ps -eo pcpu,pid -o comm= | sort -k1 -n -r | head -1 | awk '{print $3 }'`

		# Now we have variables with the old process information and with the
		# new information

		[ $USAGE2 -gt 80 ] && [ $PID1 = $PID2 ] && logger -s process $PID1 has high load
	fi
done

HISTORY
[root@localhost cool-bash]# history
    1  cd bash-scripting/
    2  vim lab8
    3  ls -lrt
    4  vim script9b
    5  vim laB8
    6  [[ -r /etc/shadow ]] && echo its readable
    7  [[ -erm 444 /etc/shadow ]] && echo its readable
    8  [[ -perm 444 /etc/shadow ]] && echo its readable
    9  stat -L -c "%a %G %U" /etc/shadow
   10  vim lab9
   11  chmod +x lab9
   12  ./lab9
   13  vim lab9
   14  ./lab9
   15  vim lab9
   16  ./lab9
   17  vim lab9
   18  man exec
   19  cd ..
   20  git clone https://github.com/sandervanvugt/cool-bash
   21  cd cool-bash/
   22  ls
   23  ./3_choosedir
   24  vim 3_choosedir
   25  vim 3b_users
   26  chmod +x 3b_users
   27  vim 3b_users
   28  ./3b_users
   29  ls
   30  vim 1_cpu-hog
   31  vim 2_what_is_it
   32  vim 4_reboot-test.sh
   33  vim lab7
   34  chmod +x lab7
   35  ./lab7
   36  bg
   37  cat lab7
   38  ls
   39  vim 8_makeusr
   40  ./8_makeusr
   41  ./8_makeusr -u 1200 -i iemand linda
   42  cat /etc/passwd
   43  vim 8_makeusr
   44  less 8_makeusr
   45  vim doit
   46  chmod +x doit
   47  ./doit
   48  ./doit -u
   49  ./doit -l
   50  ./doit -p
   51  cat doit
   52  yum install -y git vim bash-completion
   53  git clone https://github.com/sandervanvugt/bash-scripting
   54  cd bash-scripting/
   55  ls
   56  vim script1
   57  script1
   58  echo $PATH
   59  pwd
   60  ./script1
   61  chmod +x script1
   62  ./script1
   63  ls
   64  echo $?
   65  ls kuerhiughiuhuih
   66  echo $?
   67  help
   68  cd /usr/bin
   69  ls
   70  which ls
   71  which cd
   72  type cd
   73  type ls
   74  echo $?
   75  cd
   76  cd bash-scripting/
   77  ./countdown 2
   78  vim lab1.sh
   79  chmod +x lab1.sh
   80  ./lab1.sh
   81  cat lab1.sh
   82  ls
   83  vim script2
   84  ./script2
   85  chmod +x script*
   86  ./script2
   87  cat script2
   88  . script2
   89  pwd
   90  cd -
   91  vim script2b
   92  vim colors
   93  chmod + script2b
   94  ./script2b
   95  chmod +x script2b
   96  ./script2b
   97  vim colors
   98  ./script2b
   99  yum search network
  100  yum search network | grep script
  101  yum install -y network-scripts
  102  cd /etc/init.d
  103  ls
  104  vim network
  105  cd /etc/sysconfig/
  106  ls
  107  cd network-scripts/
  108  ls
  109  cat ifcfg-ens33
  110  cd
  111  cd bash-scripting/
  112  vim script2
  113  cat script2b
  114  cat colors
  115  ./countdown 12
  116  history
  117  sleep 30; ./countdown 11
  118  vim lab2
  119  vim script3
  120  ./script3 a b c d e f g h i j k l m n b
  121  cat script3
  122  vim script3
  123  ./script3 a b c d e f g h i j k l m
  124  grep '^root$' /etc/* 2>/dev/null
  125  ./countdown 3
  126  vim lab3
  127  chmod +x lab3
  128  vim lab3
  129  ./lab3 sander van vugt
  130  ./lab3 "sander van vugt"
  131  vim script4
  132  ./script4 a  b c d
  133  vim script4
  134  ./script4 a  b c d
  135  vim script4
  136  touch hello
  137  ls -l hello
  138  ./countdown 3
  139  vim lab4
  140  chmod +x lab4
  141  ./lab4
  142  ./lab4 a b c d
  143  ls
  144  for i in a b c d; do rm $i; done
  145  for i in a b c d; do rm -f $i; done
  146  ls
  147  for i in lab{1..4}; do cat $i; done
  148  for i in lab{1..4}; do echo ######## $i; cat $i; done
  149  for i in lab{1..4}; do echo '######## $i'; cat $i; done
  150  for i in lab{1..4}; do echo '########' $i; cat $i; done
  151  history
  152  vim script5
  153  cd /lib/modules
  154  ls
  155  ls -l
  156  uname -r
  157  cd ~/bash-scripting/
  158  vim script5
  159  ./script5
  160  ./countdown 2
  161  date
  162  date +%d-%m-%Y
  163  vim lab5
  164  chmod +x lab5
  165  ./lab5
  166  ls
  167  vim script6
  168  ./script6 /usr/bin/blah
  169  vim script6
  170  ./script6 /usr/bin/blah
  171  cat script7
  172  ./countdown 3
  173  vim lab7
  174  chmod +x lab7
  175  ./lab7 sander van
  176  vim lab7
  177  ./lab7 sander van
  178  vim lab7
  179  ./lab7 sander van
  180  vim lab7
  181  ./lab7 sander van
  182  vim lab7
  183  ./lab7 sander van
  184  vim lab7
  185  ./lab7 sander van
  186  vim lab7
  187  cat lab5
  188  cat lab6
  189  cat lab7
  190  vim script7
  191  vim script8
  192  cut -d : -f 1 /etc/passswd
  193  cut -d : -f 1 /etc/passwd
  194  useradd alexander
  195  useradd alex
  196  useradd lex
  197  useradd xander
  198  grep lex /etc/passwd
  199  cut -f 1 -d : /etc/passwd | grep '^lex$'
  200  ./script8 lex
  201  ./script8 alexa
  202  vim /etc/init.d/network
  203  vim script8
  204  ./script8 alexa
  205  ./script8 alex
  206  vim script8
  207  ./countdown 2
  208  vim laB8
  209  chmod +x laB8
  210  ./laB8
  211  vim laB8
  212  ./laB8
  213  vim laB8
  214  ./laB8
  215  cat lab7
  216  cat laB8
  217  man test
  218  test -f /etc/hosts
  219  echo $0
  220  echo $?
  221  test -f /etc/hosts
  222  echo $?
  223  test -f kuwrhkug
  224  echo $?
  225  [ -f khiuhiuh ]
  226  echo $?
  227  [ -f /etc/hosts ]
  228  echo $?
  229  man test
  230  [[ -f /etc/hosts ]]
  231  echo $?
  232  [[ -f khkuhkuh ]]
  233  echo $?
  234  [ 0 == 0 ]
  235  [ 0 == 1 ]
  236  echo $?
  237  [[ 0 == 1 ]]
  238  vim script9
  239  ./script9
  240  ./script9 juh
  241  vim script9b
  242  chmod +x script9b
  243  ./script9b
  244  ./script9b khk
  245  vim script9b
  246  ./script9b khk
  247  ./script9b /etc/hosts
  248  vim script9b
  249  ./script9b /etc/hosts
  250  ./script9b khk
  251  cat script9b
  252  vim /etc/init.d/network
  253  ./countdown 12
  254  [ -r /etc/shadow ] && echo "File is insecure" || echo "File is secure"
  255  ls -l /etc/shadow
  256  man test
  257  [ -w /etc/shadow ] && echo "File is insecure" || echo "File is secure"
  258  [ -x /etc/shadow ] && echo "File is insecure" || echo "File is secure"
  259  vim countdown
  260  vim script10
  261  ./script10 5
  262  ./countdown 5
  263  vim lab9
  264  ./lab9
  265  vim lab9
  266  vim lab10
  267  ./lab10
  268  chmod +x lab10
  269  ./lab10
  270  ls
  271  cat lab9
  272  cat lab10
  273  vim script11
  274  ./script11 1
  275  bash -x ./script11 1
  276  vim script11
  277  ./script11
  278  bash -x ./script11 1
  279  vim script11
  280  ./script11
  281  bash -x ./script11
  282  vim script11
  283  ./script11
  284  ./script11 1
  285  vim script11
  286  vim script12
  287  ./script12
  288  vim script12
  289  ./script12
  290  vim script12
  291  ./script12
  292  cat script12
  293  history
  294  poweroff
  295  history
  296  exit
  297  cd cool-bash/
  298  vim 3_choosedir
  299  ./3_choosedir
  300  vim 3_choosedir
  301  man test
  302  vim 3_choosedir
  303  ./3_choosedir
  304  vim 3_choosedir
  305  cd cool-bash/
  306  cd ../bash-scripting/
  307  ./countdown 5
  308  history
  309  ls
  310  rm -rf cool-bash/
  311  echo hello world
  312  git clone https://github.com/sandervanvugt/cool-bash
  313  cd cool-bash/
  314  ls
  315  vim 1_cpu-hog
  316  ps -eo pcpu,pid -o comm= | sort -k1 -n -r | head -1 | awk '{ print $1 } '
  317  ps -eo pcpu,pid -o comm=
  318  ps -eo pcpu,pid -o comm= | head
  319  ps -eo pcpu,pid -o comm= | sort -k1 -n -r
  320  ps -eo pcpu,pid -o comm= | sort -k1 -n -r | head
  321  vim 1_cpu-hog
  322  yum install -y xmail
  323  yum install -y mailx
  324  vim 1_cpu-hog
  325  dd if=/dev/zero of=/dev/null &
  326  ./1_cpu-hog
  327  vim 1_cpu-hog
  328  bash -x 1_cpu-hog
  329  vim 1_cpu-hog
  330  ./1_cpu-hog
  331  vim 1_cpu-hog
  332  cat 1_cpu-hog
  333  vim 1_cpu-hog
  334  cp ../bash-scripting/countdown .
  335  ./countdown 4
  336  vim va.sh
  337  va.sh /etc/hosts
  338  chmod +x va.sh
  339  ./va.sh /etc/hosts
  340  ./va.sh /tmp
  341  bash -x ./va.sh /tmp
  342  vim 2_cv
  343  ./2_cv /tmp
  344  vim 3_choosedir
  345  ./3_choosedir
  346  vim 3_choosedir
  347  ./3_choosedir
  348  ./countdown 13
  349  vim jc.sh
  350  chmod +x jc.sh
  351  ./jc.sh
  352  ./jc.sh alice bob carol
  353  vim 3_choosedir
  354  ./3_choosedir
  355  vim 4_reboot-test.sh
  356  ./4_reboot-test.sh
  357  cd cool-bash/
  358  cd ../bash-scripting/
  359  ls
  360  vim kube-setup.sh
  361  ./countdown 5
  362  vim va.sh
  363  man test
  364  vim va.sh
  365  cd ../cool-bash/
  366  vim 4_reboot-test.sh
  367  ./4_reboot-test.sh
  368  vim 4_reboot-test.sh
  369  ./4_reboot-test.sh
  370  cd cool-bash/
  371  vim 4_reboot-test.sh
  372  vim jc.sh
  373  vim jc2.sh
  374  vim 5_today.sh
  375  cd ../bash-scripting/
  376  vim script6
  377  ./script6 /usr/bin/blah
  378  cd ../cool-bash/
  379  vim jc2.sh
  380  vim 5_today.sh
  381  ./5_today.sh
  382  vim 5_subst.sh
  383  vim users
  384  ./5_subst.sh
  385  cat users
  386  vim 5_subst.sh
  387  vim users
  388  ./5_subst.sh
  389  cat users
  390  cat users
  391  time sed -i -e 's/lisa/bob/' users
  392  cat users
  393  strace -c sed -i -e 's/bob/lisa/' users
  394  vim 5_subst.sh
  395  ./countdown 12
  396  vim jp.sh
  397  history -w
  398  cd cool-bash/
  399  ls
  400  vim 7a_trap
  401  man 7 signals
  402  man 7 signal
  403  vim 7a_trap
  404  ./7a_trap
  405  vim 7a_trap
  406  vim 7b_trap
  407  ./7b_trap
  408  ./countdown 3
  409  vim lab7.sh
  410  chmod +x lab7.sh
  411  ./lab7.sh
  412  man signal
  413  man 7 signal
  414  vim jp7.sh
  415  vim jc7.sh
  416  vim 8_makeusr
  417  ./8_makeusr -u 1313 bill
  418  vim 8_makeusr
  419  ./8_makeusr -u 1313 bill
  420  vim 8_makeusr
  421  ./8_makeusr -u 1313 bill
  422  tail -1 /etc/passwd
  423  history