Cameron Sum Script.sh

#!/bin/bash

FILE="${1}"
PROG_NAME="$(basename "${0}")"

if test -z "${FILE}";then
   echo "Usage: ${PROG_NAME} <file>"
   exit 1
fi

if test ! -f "${FILE}";then
   echo "${PROG_NAME}: ${FILE}: file not found"
   exit 2
fi

# set initial values
LINECOUNT="$(wc -l "${1}" |awk '{print$1}')"
COUNT=0
SUM=0
LASTPAIR="x"

# start loops
while test ${COUNT} -lt ${LINECOUNT};do
   COUNT=$((${COUNT}+1))

   LINE="$(sort "${FILE}" |head -${COUNT} |tail -1)"
   ARG1="$(echo "${LINE}" |awk '{print$1}')"
   ARG2="$(echo "${LINE}" |awk '{print$2}')"
   ARG3="$(echo "${LINE}" |awk '{print$3}')"

   # compare logs
   if test "${LASTPAIR}" == "${ARG1}:${ARG2}";then
     SUM=$((${SUM} + ${ARG3}))
   else
      test "${LASTPAIR}" == "x" || echo -e "${LASTPAIR/:/\t}\t${SUM}"
      LASTPAIR="${ARG1}:${ARG2}"
      SUM=${ARG3}
   fi

done
echo -e "${LASTPAIR/:/\t}\t${SUM}"