Shell Programming and Scripting

#! /bin/bash

FIRST=`awk 'BEGIN{FS="|";OFS=" "}NR==1{print $1}' /temp/temp.txt` 
# NOT     FIRST=1226045443l     BUT    FIRST=1226045443
SECOND=`awk 'BEGIN{FS="|";OFS=" "}NR==2{print $1}' /temp/temp.txt`
# NOT     SECOND=1226045402l     BUT     SECOND=1226045402

((str=$FIRST+$SECOND))  #or str=$((FIRST+SECOND))
echo $str

#! /bin/bash

FIRST=`awk 'BEGIN{FS="|";OFS=" "}NR==1{print $1}' /temp/temp.txt`
SECOND=`awk 'BEGIN{FS="|";OFS=" "}NR==2{print $1}' /temp/temp.txt`

let str=$FIRST+$SECOND
echo $str

#!/bin/ksh
awk 'NR<=2{print $1}' FS='|' ORS=' ' /tmp/temp.txt |read FIRST SECOND
echo $FIRST
echo $SECOND
res=$(( FIRST + SECOND ))
echo $res