Shell Programming and Scripting

$ cat file1
John 5441223
Sandy 113446
Jill 489799
$ cat file2
Sandy Tuesday
Jill Friday
John Monday
$
$
$ sort < file1 > file1.sorted
$ sort < file2 > file2.sorted
$
$ join file2.sorted file1.sorted
Jill Friday 489799
John Monday 5441223
Sandy Tuesday 113446
$

while read nm day
do
  grep $nm file1 | read name no
  echo $name $day $no
done <file2

awk ' { arr[$1] = arr[$1] ? arr[$1]" "$2 : $2 }
END {
     for( key in arr ) { print key " " arr[key] }
}' file2 file1