log_sum.sh

#!/bin/bash


if [ "$#" -le 0 ]; then
    echo "Usage $0 [-n N] (-c|-2|-r|-F|-t) <filename>"
    exit 2
fi

FILE="${@: -1}" #File is the last argument
nrOfResult=0




#-r FILE exist and read permission.
if [ ! -r $FILE ]; then
    
    echo "File does not exist, using stdin\n"
    cat <&0 > "$FILE" 
    
    #exit 2
fi


function mostConnectionAttemps() {
    # 1. Get all ips from file
    # 2. Sort
    # 3. Uniq --count (prefix lines by the number of occurrences)
    # 4. Sort numeric and reverse the result
    # 5. Change place of the arguments of the result of sort.
    local VAR=`awk '{ print $1 }' $FILE | sort | uniq --count | sort -nr | awk '{ print $2, "\011", $1}'`
    myPrint "$VAR" "<IP><NrOfResult>" "$1"

}


function mostSuccessfulAttemps() {
    local VAR=`awk {'print $9, $1 '} $FILE | grep -E '^2..|^3..' | sort | uniq --count | sort -rn | awk {'print $3, "\011", $1'}`
    myPrint "$VAR" "<ip><nrOfRequests>" "$1"
}


function mostBadRequest() {
    local VAR=`awk {'print $9, $1 '} $FILE | grep -E '^4..|^5..' | sort | uniq --count | sort -rn | awk {'print $2, "\011", $3'}`
    myPrint "$VAR" "<Code><Ip>" "$1"
}

function mostCommonResultCode() {
    # 1. Get all status codes
    # 2. Sort
    # 3. Uniq --count
    # 4. Sort numeric and reverse
    # 5. Change order of print by using awk.

    local VAR=`awk {'print $9, $1'} $FILE | sort | uniq --count | sort -rn | awk {'print $2, "\11", $3'}`   
    myPrint "$VAR" "<StatusCode><ip>" "$1"  

}



function countBytesByIp() {
   
    # local VAR=`awk {'if ($10 !="-")print $10, $1'} $FILE | sort -k2,2 | awk '{arr[$2]+=$1} END { for(i in arr) { print i, "\011", arr[i]}}' | sort -rnk2,2`
    # myPrint "$VAR" "<ip><bytes>" "$1"


    # Get all ips with bytes
    # Group all ips and perform
        # sum += byte
    local VAR=`awk {'if ($10 !="-")print $10, $1'} $FILE | sort -k2,2`
    
    local counter=0

    for line in $VAR; do
        
        #local ip=`echo $line | cut -d ' ' -f 1`
        
        #echo $ip

#        cat $line | cut -d ' ' -f1  $ip
        ip=${line%% *}
        printf "%s\n" "$ip"
        
        let counter+=1;

        
    done

    

}


# $1 $VAR 
# $2 Description
# $3 N - Number of results.
function myPrint() {
    # If we have -N set, use head to limit the results
    if [ "$3" -gt 0 ]; then
        echo "$2"
        printf "$1" | head -n "$3"
    else
        printf "$2\n$1"
    fi
}



while getopts :n:c2rFt option
do
    case $option in
        n)
            nrOfResult=$OPTARG
            ;; 
        c)
            # call function with argument (N)
            mostConnectionAttemps $nrOfResult
            ;;
        2)
            mostSuccessfulAttemps $nrOfResult
            ;;
        r)
            mostCommonResultCode $nrOfResult
            ;;
        F)
            mostBadRequest $nrOfResult
            ;;

        t)
            countBytesByIp $nrOfResult
            ;;

                #*)
#            echo "Not a valid argument"
 #           ;;
    esac
done