#!/bin/sh
#
# AUTHOR:  Bill Facey                           DATE:  7 Feb 1996
# Modified By:  Robert Grumbine                       10 Sep 1997
# Modified By:  David Michaud                         12 Mar 1999
#               FOR IBMSP
#
# Original:
# This script manages logfiles listed in loop below.
# When they exceed $KEEPJLOG lines they are renmaed to ${logfile}.old 
# and a new logfile is started up.
#
# Modification: 
#   In order to have the logfile on hand for diagnostics after a 
#   weekend, maximum number of lines is set to MAXJLOG.  Execution
#   of the manager is moved to the ADMIN net, and out of scripts
#   callable by users.  In moving to the jlogfile.old, the last MAXJLOG 
#   lines are retained in jlogfile for diagnosing recent problems.
#   As part of ADMIN net, this script is run every 6 hours. 
#   The logfiles are kept up to the MAXJLOG entries in a series of files,
#   each KEEPJLOG lines long, and named ${logfile}.old.$n where n
#   runs from 1 to MAXJGLO/KEEPJLOG (integer division) + 1.
#
#Start SMS

$SMSBIN/smsinit

set -x

#
# MAXJLOG  = Maximum number of lines to permit
# KEEPJLOG = Number of lines to retain
# lc       = Line counter
#

for log in jlogfile snd2forgn_log
do
   case $log in
           jlogfile) MAXJLOG=75000
                     KEEPJLOG=5000
                     logfile=/com/logs/jlogfile;;
      snd2forgn_log) MAXJLOG=30000
                     KEEPJLOG=10000
                     logfile=/com/logs/snd2forgn_log;;
             *);;     
   esac

   NLOG=`expr $MAXJLOG \/ $KEEPJLOG + 1`
   lc=`wc -l ${logfile} | awk '{print $1}'`

   set +x
   echo ""
   echo "lc=$lc NLOG = $NLOG, MAXJLOG=$MAXJLOG, KEEPJLOG=$KEEPJLOG "
   echo ""
   set -x

   #
   # When logfile gets more that twice the size of KEEPLOG, start the
   # moving and recopying.  MAXLOG specifies how may of these
   # files we'll keep around.
   #
   linelim=`expr $KEEPJLOG \* 2`

   if [ "$lc" -gt "$linelim" ] ; then
      cp ${logfile} ${logfile}.old
      rel=`expr $lc - $KEEPJLOG` 
      tail -n +$rel ${logfile}.old > ${logfile}

      echo ""
      echo "HIT CTRL-C AND RESTART SCROLLING JLOGFILE." >> ${logfile}
      echo ""
      msg="Z ${logfile} restarted."
      unset time
      time=`date -u | cut -f2-5 -d ' '`
      echo "${time}${msg}" >> ${logfile}
      #
      # Now start the progressive aging of the old.N files to keep the most
      # recent NLOG present:
      #
      j=2
      k=`expr $j - 1`
      while [ $j -le $NLOG ]
      do
        if [ -f ${logfile}.old.$j ] ; then
          mv ${logfile}.old.$j ${logfile}.old.$k
        else
          touch ${logfile}.old.$k
        fi
        j=`expr $j + 1`
        k=`expr $j - 1`
      done
      #
      # The following is to ensure no overlap between the live log and the
      # archived log.
      #
      lc=`wc -l ${logfile}.old | awk '{print $1}'`
      k=`expr $lc - $KEEPJLOG `
      head -n $k ${logfile}.old > ${logfile}.old.$NLOG
      rm ${logfile}.old
   else
      set +x
      echo ""
      echo "${logfile} doing fine"
      echo ""
      set -x
   fi
done

$SMSBIN/endt