Shuffling two files and merge data

Question

For Example: I have two files

input.txt

one
two
three
four
five

output.txt

1
2
3
4
5

I want to merge these two files and to get another output file (e.g, match.txt) like this,

one 1
two 2
three 3
...

Moreover, when I shuffle these two .txt files randomly, the output file (match.txt) will also merge the correct data like that...

three 3
two 2
five 5
...

How can I write shell script?

Answer 1

Simply with paste command:

paste -d' ' input.txt output.txt > match.txt

The match.txt content:

one 1
two 2
three 3
four 4
five 5

---

With shuffling (via sort command):

paste -d' ' input.txt output.txt | sort -R

An exemplary output:

two 2
four 4
one 1
three 3
five 5

Answer 2

$ cat input.txt
five
one
three
two
four

$ awk 'BEGIN{a["one"]=1;a["two"]=2;a["three"]=3;a["four"]=4;a["five"]=5}$0 in a{print $0,a[$0]}' input.txt
five 5
one 1
three 3
two 2
four 4