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Bash - Parse a line from a file

Example File:

07/17 21:04:01 sndc addr unit 1 : hu P1 (TempLinc)
07/17 21:04:02 sndc func StatusReq : hc P
07/17 21:04:04 rcvi addr unit 15 : hu P15 (TempAck_5)
07/17 21:04:04 rcvi func Preset : level 11
07/17 21:04:04 Temperature = 78 : hu P0 (office_temp)
07/17 21:19:01 sndc addr unit 1 : hu P1 (TempLinc)
07/17 21:19:02 sndc func StatusReq : hc P
07/17 21:19:05 rcvi addr unit 15 : hu P15 (TempAck_5)
07/17 21:19:05 rcvi func Preset : level 11
07/17 21:19:05 Temperature = 78 : hu P0 (office_temp)

#!/bin/bash

fil=/home/test.log

# Test for existence of the test file
if [ -f $fil ]
then

  # Read through the file looking for the word Temperature =

  while read line
  do
    echo $line | grep -q Temperature
    if [ $? == 0 ]; then
    mytemp=`echo $line  | cut -d = -f2 | cut -d : -f1`
    echo "Current temperature is: $mytemp"
    fi
  done < $fil

fi

Returns:

Current temperature is:  78 
Current temperature is:  78

Only get last temperature record

#!/bin/bash
fil=/home/heyu.log.ttyS0

if [ -f $fil ]
then

mytemp=`grep Temperature $fil | tail -1 | cut -d = -f2 | cut -d : -f1`
echo "Current temperature is: $mytemp"

fi