Linux/Unix coreutils command ‘paste’ to merge lines of files

Unix and Linux GNU coreutils command paste can be useful to merge corresponding or subsequent lines of files. Here is simple example of it’s usage:

viper@viper-laptop:~$ cat /tmp/test

pop
pop1
pop2

viper@viper-laptop:~$ cat /tmp/test1

1
2
3
4

viper@viper-laptop:~$ paste /tmp/test /tmp/test1

pop     1

pop1    2

pop2    3

        4