I have two text files, each of them contains an information by line such like that

```
file1.txt            file2.txt
----------           ---------
linef11              linef21
linef12              linef22
linef13              linef23
 .                    .
 .                    .
 .                    .

```

I would like to merge theses files lines by lines using a bash script in order to obtain:

```
fileresult.txt
--------------
linef11     linef21
linef12     linef22
linef13     linef23
 .           .
 .           .
 .           .

```

How can this be done in Bash?