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#!/bin/sh

# 2008 Jon Mulder <mulderje@muohio.edu>

AWK=/usr/bin/awk
EGREP=/bin/egrep
FREE=/usr/bin/free
GREP=/bin/grep
HEAD=/usr/bin/head
PERL=/usr/bin/perl
PS=/bin/ps
SORT=/usr/bin/sort

TOTALMEM=`$FREE -m | $GREP Mem | $PERL -pe 's/Mem:\s+([0-9]+).*/$1/'`
RETVAL=0
case "$1" in
    nginx)
          $PS aux | $GREP nginx | $EGREP -v 'grep|/bin/sh' |
          $AWK -v totalmem="$TOTALMEM" 'BEGIN { total=0; printf "%-10s %-10s %-10s %s\n", "USER", "%MEM", "PID", "PROCESS TYPE"
                                   print "---------------------------------------------" }
                                   { printf "%-10s %-10.2f %-10s %s\n", $1, $4, $2, $12; total+=$4; }
                  END { printf "%-10s %-10.2f %-0.0f MB used\n", "TOTAL:", total, (total/100)*totalmem }'
      RETVAL=$?
  ;;
    thin)
          $PS aux | $GREP thin | $EGREP -v 'grep|/bin/sh' |
          $AWK -v totalmem="$TOTALMEM" 'BEGIN { total=0; printf "%-10s %-10s %-10s %s\n", "USER", "%MEM", "PID", "SERVER:PORT"
                                   print "--------------------------------------------" }
                                   { printf "%-10s %-10.2f %-10s %s\n", $1, $4, $2, $13; total+=$4; }
                  END { printf "%-10s %-10.2f %-0.0f MB used\n", "TOTAL:", total, (total/100)*totalmem }'
      RETVAL=$?
  ;;
    php)
        $PS aux | $GREP php5 | $EGREP -v 'grep|/bin/sh' |
        $AWK -v totalmem="$TOTALMEM" 'BEGIN { total=0; printf "%-10s %-10s %-10s %s\n", "USER", "%MEM", "PID", "EXECUTABLE"
                         print "-------------------------------------------" }
                         { printf "%-10s %-10.2f %-10s %s\n", $1, $4, $2, $11; total+=$4; }
                END { printf "%-10s %-10.2f %-0.0f MB used\n", "TOTAL:", total, (total/100)*totalmem }'
    RETVAL=$?
  ;;
        top)
        [ -n $2 ] && [ $2 -eq $2 2> /dev/null ] && NUM=$2 || ( NUM=10 && echo "$2 is not a number - Using 10 by default" )
        $PS aux | $SORT -nr -k 4 | $HEAD -$NUM |
        $AWK -v totalmem="$TOTALMEM" 'BEGIN { total=0; printf "%-10s %-10s %-10s %-10s %s\n", "USER", "%MEM", "MEM", "PID", "EXECUTABLE"
                         print "------------------------------------------------------" }
                         { printf "%-10s %-10s %-10.2f %-10s %s\n", $1, $4, ($4/100)*totalmem, $2, $11; total+=$4; }
                END { printf "%-10s %-10.2f %-0.0f MB used\n", "TOTAL:", total, (total/100)*totalmem }'
    RETVAL=$?
        ;;
    *)
      echo "Usage: mem {nginx|thin|php|top [number]}"
      exit 1
  ;;
esac
exit $RETVAL