Merging lines in two files

merge 1st line file1  2nd line as 1st line of 2nd file 

#! /bin/sh

echo "enter the first file name"

read first_file

echo "enter the second file name"

read second_file

echo "$first_file  $second_file"

echo "enter output file name"

read out_file

merge(){

paste -d"\n" $first_file $second_file|sed -e '/^$/d'>$out_file

}

merge;

I/P:

cat file1

aaa

bbb

ccc

bash-4.2$ cat file2

a

b

c

d

e

execution:

bash-4.2$ merge.sh

enter the first file name

file1

enter the second file name

file2

file1  file2

enter output file name

out

O/P:

bash-4.2$ cat out

aaa

a

bbb

b

ccc

c

d

e