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

If I run cat file1.txt, I have:

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

Then cat file2.txt gives:

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

But what if I want to make output like this?

file1.txt file2.txt
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

1

2 Answers

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.

1

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

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