How to get the output of two cat commands parallel to each other

Solution 1:

What you need is paste commad which paste rows in files side by side:

paste file1.txt file2.txt

This outputs exactly what you wanted.

For more options check man paste.

Solution 2:

pr will do what you want when used like so:

pr -mt file1.txt file2.txt

• -m will print all files in parallel.
• -t will omit page headers and trailers.

Example output:

linux mint              linux mint
ubuntu                  cent-os
cent-os                 fedora
fedora                  kali linux
debian                  arch linux
kali linux              kubuntu
arch linux              open
kubuntu                 deepin
open suse               parrot
deepin                  ubuntu
parrot os               debian