#!/bin/bash
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# $Header: /var/log/sar/RCS/cpu,v 1.4 1997/06/19 04:31:05 dgavin Exp dgavin $
#
# cpu - display cpu utilization
#
# input - /var/log/sar/data/cpu.Mondd.yy
# output- chart showing time spent in user/sys/nice states
#
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#
trap '/bin/rm /tmp/gnuplot.cpu.* 2>/dev/null;exit' SIGHUP SIGINT SIGQUIT SIGTERM
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# Function definitions
#
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function checkForEmpty {
if [ ! -s ${1} ] ; then
  echo "0 0" >${1}
fi
return
}
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# Mainline code
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#
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# Variable initialization
#
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HARDCOPY=""
GHOSTVIEW=""
CMDNAME=`basename $0`
#
HELP="${CMDNAME} generates X11 or hardcopy graph of cpu utilization."
USAGE="${CMDNAME} [-DHLVhPp] [MonDD[.YY]]
  -D turns on execution tracing
  -H displays help info and exits
  -L displays RCS log and exits
  -V display Revision info and exits
  -h displays help info and exits
  -P Print without display
  -p display and offer print option

  MonDD.YY - day to work with, defaults to today
   i.e. Jun12.97 -the year will default to this year

"
#
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# Parse options
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#
while getopts DHLVhPp c ; do
  case ${c} in
    h|H) echo -e "\n${HELP}\n\n${USAGE}\n"
       exit 1
       ;;
    p) HARDCOPY="YES"
       GHOSTVIEW="YES"
       ;;
    P) HARDCOPY="YES"
       GHOSTVIEW=""
       ;;
    D) echo "DEBUG ON"
       set -x
       DEBUG="yes"
       trap '' SIGHUP SIGINT SIGQUIT SIGTERM
       ;;
    L) echo '
$Log: $
'
       exit 1
       ;;
    V) echo '$Revision: $'
       exit 1
       ;;
    ?) echo -e "\n${USAGE}\n"
       exit 3
       ;;
  esac
done
# re-align the positional parameters as $1, $2,...
shift `expr ${OPTIND} - 1`
#
cd /var/log/sar/data
if [ $# -eq 0 ] ; then
 FN="cpu.`date +%b%d.%y`"
else
 l=`echo ${1} | wc -c`
 l=`expr ${l} + 0`
 case ${l} in
  6) FN="cpu.${1}.`date +%y`";;
  9) FN="cpu.${1}";;
  *) echo -e "\n${CMDNAME}: Invalid date  - ${1}\n"
     exit
     ;;
 esac
fi
if [ ! -f ${FN} ] ; then
  echo "No such file: ${FN}"
  exit
fi
if [ ! -r ${FN} ] ; then
  echo "File not readable: ${FN}"
  exit
fi
if [ ! -s ${FN} ] ; then
  echo "File empty: ${FN}"
  exit
fi
#
#     user    nice    system  idle
#0940 8065221 3719924 2017086 53289599
awk '
BEGIN{}
{
 if (NR == 1) {
   old_user = $2;
   old_nice = $3;
   old_sys = $4;
   old_idle = $5;
 } else {
   mm=substr($1,3,2) * .016;
   tim=substr($1,1,2)+mm;
   if ( old_user > $2 ) {
     user = 0;
     nice = 0;
     sys = 0;
     idle = 0;
     reboot = 100;
   } else {
     user = $2 - old_user;
     nice = $3 - old_nice;
     sys = $4 - old_sys;
     idle = $5 - old_idle;
     reboot = -1;
   }
   total = user + nice + sys + idle ;
   if ( user == 0 ) { puser = 0; } else { puser= (user / total) * 100;}
   if ( sys  == 0 ) { psys  = 0; } else { psys = (sys  / total) * 100;}
   if ( nice == 0 ) { pnice = 0; } else { pnice= (nice / total) * 100;}
   if ( idle == 0 ) { pidle = 0; } else { pidle= (idle / total) * 100;}

   printf("%5.2f %7.2f %7.2f %7.2f %7.2f %d\n",
          tim, pidle+puser+psys+pnice,
          puser+psys+pnice, psys+pnice, pnice,reboot) >"/tmp/gnuplot.cpu";

   old_user = $2;
   old_nice = $3;
   old_sys = $4;
   old_idle = $5;
 }
}
END{}' ${FN}
#
# Get system name and date of report into variables...
system=`hostname -s | /usr/bin/tr "[A-Z]" "[a-z]"`
sysdate=`echo ${FN} | cut -c 5-`
/bin/echo "Generating plot for $system $sysdate"
#
# Set gnuplot variables as needed
#
if [ -z ${HARDCOPY} ]; then
  TERMINAL="set terminal X11"
  PAUSE="pause 10"
  YLABEL=""
else
  TERMINAL='set terminal postscript landscape monochrome dashed "Times-Roman" 18
set output "/tmp/gnuplot.cpu.ps"'
  PAUSE=""
  YLABEL='set ylabel "Nice|Sys|User|Idle"'
fi
#
# Generate the plots
#
gnuplot <<EOF
${TERMINAL}
set data style lines
set nogrid
set key
set title "CPU Activity - $system On $sysdate"
set xlabel "Time of Day"
set xrange [00:24]
set xtics 0,1,24
${YLABEL}
set yrange [0:140]
set ytics 0,10,100
plot \
"/tmp/gnuplot.cpu" using 1:2 title "idle" with line 1, \
"/tmp/gnuplot.cpu" using 1:3 title "user" with line 3, \
"/tmp/gnuplot.cpu" using 1:4 title "sys" with line 2, \
"/tmp/gnuplot.cpu" using 1:5 title "nice" with line 4, \
"/tmp/gnuplot.cpu" using 1:6 title "reboot" with points 2
${PAUSE}
quit
EOF
#
if [ .${HARDCOPY} = ".YES" ]; then
  if [ -z ${GHOSTVIEW} ] ; then
    lpr /tmp/gnuplot.cpu.ps
  else
    ghostview -upsidedown -landscape -magstep 0 /tmp/gnuplot.ps
    echo "Print ?"
    read ans
    if [ ${ans} = "y" ] ; then
      lpr /tmp/gnuplot.ps
    fi
  fi
  rm /tmp/gnuplot.cpu.ps  2>/dev/null
fi
# clean up the junk
if [ ${DEBUG}. = "." ]; then
  rm /tmp/gnuplot.cpu 2>/dev/null
fi