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I'm currently reading from 2 input files
But the second file I only need once.

How can I check if a word exists in the second file?

For example

LINE:
This is a phrase.

OUTPUT
is

The command should return the word on a chosen position.
In this case, I asked for the second word.

How to find a line number?

I have a file:

1
5
8
9
10
15

Is there a simple method to find out on which line for example the 9 is written?

No. It is a question asked on previous exams and
I was wondering how to answer it.

Yes. No 'uniq' or 'sort' this time :(

Hi,

INPUT:
DCBADD

OUTPUT:
ABCD

The SED script should alphabetically sort the chars in the string and remove the duplicate chars.