getSmallerEpoch.sh

#!/bin/bash
#This script is to get smaller Epoch values than the specified value in an Oplog dump.
#It assumes you have kept your readable dump at the same loction where this script is.
#author a.naudiyal

SED=`which sed`
JQ=`which jq`
UNIQ=`which uniq`
TR=`which tr`
CAT=`which cat`
GREP=`which grep`
PYTHON=`which python`

OPDIR=`pwd`
echo "Enter epoch value: "
read epochv

if [ ! -f $OPDIR/oplog.rs.json ];then
echo "oplog.rs.json file not found. Exiting..."
exit 1
fi

$SED -i s/\$timestamp/timestamp/g oplog.rs.json
ARRAY=$($JQ '.ts.timestamp.t' <oplog.rs.json |$UNIQ |$TR "\n" ",";echo)

#Generate Python code and get the epoch value
$CAT <<EOF >/tmp/smaller.py
#!$PYTHON

import bisect

mylist = [$ARRAY]
mylist.sort()

f = open('Onesmaller', 'w')
index = bisect.bisect(mylist, $epochv)
print>>f, mylist[index-1]
f.close()
EOF

# Find ordinal numbers for the epoch value

cd /tmp
chmod 755 smaller.py
$PYTHON smaller.py

EPOCHVAL=`cat /tmp/Onesmaller`
clear
echo "Final epoch value is $EPOCHVAL "
echo
echo "And the Ordinal numbers associated with this Epoch value is/are:"
echo
cd $OPDIR
$JQ '.ts.timestamp.t, .ts.timestamp.i' < oplog.rs.json |$GREP -w $EPOCHVAL -A1


##Cleanup
rm -f /tmp/Onesmaller
rm -f /tmp/smaller.py

#end of script