Hello,
I am an absolute newbie and whatever I've written in the shell script (below) has all been built with generous help from googling the net and this forum. Please forgive any schoolboy mistakes.

Now to the qn, my input file looks like this -

2009:04:03 08:21:41:513,INFO ,servername,yyyy,undefined,,INFO,null,.....Out:xxService,Start - SvcName: OIS - EndUserName: - RequestId: null20090403082313
2009:04:03 08:21:41:775,INFO ,servername,yyyy,undefined,,INFO,null,.....Out:xxService,End - SvcName: OIS - EndUserName: - RequestId: null20090403082313 - StatusCode: 0 - StatusText: Success
2009:04:03 08:21:45:660,INFO ,servername,yyyy,undefined,,INFO,null,.....Out:xxService,Start - SvcName: VCC - EndUserName: - RequestId: 411111111111111120090403082318
2009:04:03 08:21:46:171,INFO ,servername,yyyy,undefined,,INFO,null,.....Out:xxService,End - SvcName: VCC - EndUserName: - RequestId: 411111111111111120090403082318 - StatusCode: 0 - StatusText: Success
2009:04:03 08:21:49:583,INFO ,servername,yyyy,undefined,,INFO,null,.....Out:xxService,Start - SvcName: CO - EndUserName: - RequestId: 20090403082321
2009:04:03 08:22:03:571,INFO ,servername,yyyy,undefined,,INFO,null,.....Out:xxService,End - SvcName: CO - EndUserName: - RequestId: 20090403082321 - StatusCode: 0 - StatusText: Success

From this I have to find out the resp time (start time - end time) for each request id for the SvcName CO. I have written this shell script (not finished though) however the performance is very slow (takes a minute to process a 100 line file). can you please point me in the right direction to improve the performance? Although not the exact subject of this post, if any pointers can be given to calculate the difference between start and end time, it will be quite helpful.

Code:

#!/bin/bash
#script to resptime timings for CO call from logfile
#////////////////////////////////////
#if no command line args
    if [ $# -ne 1 ]
    then
    echo 1>&2"Oops......Usage is wrong. $0 <tgtsrchfile>"
    exit 2
    fi
#assigning command line params to variables
srchFN=$1
#remove resptime.log if already present
checkfile="./resptime.log"
tempfile="./temp.log"
tempfile1="./temp1.log"
    if [ -e $checkfile ];then
    rm -r $checkfile
    fi
    if [ -e $tempfile ];then
        rm -r $tempfile
    fi
    if [ -e $tempfile1 ];then
        rm -r $tempfile1
    fi
    #if keywordfile not present
    if [ ! -r $srchFN ]; then
    echo Target search file $srchFN not present
    exit 2
    fi
#grep for request id
        grep 'Start.*CO' $srchFN | awk -F "RequestId: " '{print $2}'>temp.log
#for each request id get starttime and end time and print into temp file
        cat temp.log | while read line; do
        #if string is empty
        if [ -n $line ];then
        sttime=`grep Start.*CO.*$line $srchFN | awk -F "," '{print $1}'|awk -F " " '{print $2}'`
        endtime=`grep End.*CO.*$line $srchFN | awk -F "," '{print $1}'|awk -F " " '{print $2}'`
            if [ -n "$sttime" -o -n "$endtime" ];then
            echo $line,$sttime,$endtime>>temp1.log
            fi
        fi        
        done;
        
#/////////////////////////////////////

Thanks in advance