Shell Programming and Scripting

#!/bin/sh
# scriptname : weather_format
# purpose : to format the original weather forcast
i=1
j=1
while [ $i -lt `wc -l $1 | gawk 'BEGIN{FS=" "}{printf $1}'` ]
do
	if echo `sed -n "$i""p" $1` | grep "New York"
	then
		j=$i
		sed -n "$j""p" $1 >> ./weather_formatting.txt
		j=`expr $j + 1`
		until echo `sed -n "$j""p" $1` | grep -E "New York|Ottawa"
		do
			sed -n "$j""p" $1 >>./weather_formatting.txt
			j=`expr $j + 1`
		done
		i=$j
	else
		i=`expr $i + 1`
	fi
done

awk '
        BEGIN {
                print "##############    Weather Forcasts for Primary Cities in U.S.     ##############"
                print "--------------------------------------------------------------------------------"
        }

        NR == 1 {
                H = "Location        Temperature(F)  Precipiation(%)         Humidity(%)     Wind(mph)"
        }

        NR > 1 {
                T = $( NF - 4 )
                A[T] = $0
                P = $0
                sub ( /[0-9].*/, X, P )
                V[P","T] = $0
        }

        END {
                for ( k in A )
                {
                        printf "\nTime : %s\n", k
                        print  H
                        for ( p in V )
                        {
                                if ( p ~ k )
                                {
                                        sub ( k, X, V[p] )
                                        print V[p]
                                }
                        }
                }
        }
' file