This is one of the best command that facilitates the system admin to perform his specific tasks. Below is the list with the examples showing the paste command.
[localhost@localhost ~]$ cat file1
apple
orange
mango
banana
[localhost@localhost ~]$ cat file2
coldplay
westlife
michael
sunibigyana
piyush
[localhost@localhost ~]$ paste -s file1
apple orange mango banana
[localhost@localhost ~]$ paste -d, -s file1
apple,orange,mango,banana
[localhost@localhost ~]$ paste - - < file1
apple orange
mango banana
[localhost@localhost ~]$ paste -d':' - - < file1
apple:orange
mango:banana
[localhost@localhost ~]$ paste - - - < file1
apple orange mango
banana
[localhost@localhost ~]$ paste -d ':,' - - - < file1
apple:orange,mango
banana:,
[localhost@localhost ~]$ cat file2
coldplay
westlife
michael
sunibigyana
piyush
[localhost@localhost ~]$ paste file1 file2
apple coldplay
orange westlife
mango michael
banana sunibigyana
piyush
[localhost@localhost ~]$ paste -d, file1 file2
apple,coldplay
orange,westlife
mango,michael
banana,sunibigyana
,piyush
[localhost@localhost ~]$ cat file2 | paste -d, file1 -
apple,coldplay
orange,westlife
mango,michael
banana,sunibigyana
,piyush
[localhost@localhost ~]$ cat file1 | paste -d, - file2
apple,coldplay
orange,westlife
mango,michael
banana,sunibigyana
,piyush
[localhost@localhost ~]$ cat file1 file2 | paste -d, - -
apple,orange
mango,banana
coldplay,westlife
michael,sunibigyana
piyush,
[localhost@localhost ~]$ paste -d'\n' file1 file2
apple
coldplay
orange
westlife
mango
michael
banana
sunibigyana
piyush
[localhost@localhost ~]$