###########################################################
# pu.sh - list or count portal users for the last X minutes
# J. David Schronce - Tue Jan  1 01:24:35 CST 2008
###########################################################
# BACKTIME - how many minutes into the past to look for 
#            portal users - maximum 59
#
# An attempt is made here to standardize the web server
# log directories.  On my servers they have a consistant
# beginning, which I call LOGDIR, followed by the Environment
# name, and ending with "access.log" - which I call
# LOGEXT.  Hopefully you can find similarities for your
# log files.
#
###########################################################
BACKTIME=20
LOGDIR=/apps/ihs/*/logs
LOGEXT=access.log
###########################################################
# End of User Defined Variables
###########################################################
USAGE="\nUSAGE: $0 <-c | -u > <envname> [HH] [MM]\n
-c: User Count\n
-u: User List\n
HH and MM are optional\n
\n\n
Examples:\n
$0 -u prod will show all the users using PROD env in the last $BACKTIME minutes\n
where $BACKTIME is the number of minutes defined in the BACKTIME variable\n
\n
$0 -c prod will show the number of unique users using PROD env in the\n last $BACKTIME minutes\n
\n
$0 -c prod 11 20 will show the number of unique users using PROD env in the\n $BACKTIME minutes preceeding 11:20 AM\n
\n-c and -u are exclusive\n
\n HH and MM must be used together\n"

if [ $# -lt 2 ] 
then
  echo $USAGE
  exit
fi
if [ $# -eq 3 ] 
then
  echo $USAGE
  exit
fi
if [ $# -gt 4 ]
then
  echo $USAGE
  exit
fi
##############################################################
# Validate Environment Name
LAENV=$2
##############################################################
> /tmp/LIST.$$
MIN=`date +%M`
HR=`date +%H`
if [ $# -eq 4 ]; then
  HR=$3
  MIN=$4
fi

# calc minutes
CHKMIN=`echo "$MIN - $BACKTIME" | bc`
case $CHKMIN in
  ?) CHKMIN="0$CHKMIN";;
esac

if [ $CHKMIN -lt 0 ]; then
  CHKMIN=`echo "$CHKMIN + 60" | bc`
  CHKHR=`echo "$HR - 1" | bc`
else
  CHKHR=$HR
fi

if [ $CHKHR -lt 0 ]; then
  CHKHR=23
fi

case $CHKHR in
  ?) CHKHR="0$CHKHR"
esac

DATE=`date +%d/%b/%Y`

########################################################################
# List & count Users
########################################################################
# cycle thru times
########################################################################
STARTMIN=$CHKMIN
STARTHR=$CHKHR
if [ $CHKMIN -gt $MIN ]; then
  MAXMIN=`echo "$MIN + 60" | bc `
  case $MAXMIN in
    ?) MAXMIN="0$MAXMIN";;
  esac
else
  MAXMIN=$MIN
fi

while [ $CHKMIN -le $MAXMIN ]
do
  if [ $CHKMIN -gt 59 ]; then
    RMIN=`echo "$CHKMIN - 60" | bc`
    RHR=`echo "$CHKHR + 1" | bc`
  else
    RMIN=$CHKMIN
    RHR=$CHKHR
  fi
  case $RHR in
   ?) RHR="0$RHR";;
  esac
  case $RMIN in
   ?) RMIN="0$RMIN";;
  esac
# Write out user name
  if [ -f $LOGDIR/$LAENV.$LOGEXT ]; then
    grep "$DATE:$RHR:$RMIN" $LOGDIR/$LAENV.$LOGEXT | grep -v "\- \-" | awk '{print $3}' | sort -u >> /tmp/LIST.$$
  fi

  CHKMIN=`echo "$CHKMIN + 1 " | bc`
done

HEADER="User(s) between $STARTHR:$STARTMIN and $HR:$MIN"
if [ -f /tmp/LIST.$$ ]; then
  case $1 in
    -c) echo "`cat /tmp/LIST.$$ | grep -v ^$ | sort -u | wc -l`  $HEADER";;
    -u) echo "\n$HEADER";cat /tmp/LIST.$$ | grep -v ^$ | sort -u;;
     *) echo $USAGE; exit;;
  esac
# Cleanup
  rm /tmp/LIST.$$
else
  echo "0 $HEADER"
fi