How to merge two files line by line in Bash

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?

You can use paste:

paste file1.txt file2.txt > fileresults.txt

here's non-paste methods

awk

awk 'BEGIN {OFS=" "}{
  getline line < "file2"
  print $0,line
} ' file1

Bash

exec 6<"file2"
while read -r line
do
    read -r f2line <&6
    echo "${line}${f2line}"
done <"file1"
exec 6<&-

Try following.

pr -tmJ a.txt b.txt > c.txt

Check

man paste

possible followed by some command like untabify or tabs2spaces

You can use paste with the delimiter option if you want to merge and separate two texts in the file

paste -d "," source_file1 source_file2 > destination_file

Without specifying the delimiter will merge two text files using a Tab delimiter

paste source_file1 source_file2 > destination_file