3 added 60 characters in body
source | link

This should do:

paste file_1 file_2 file_3 file_4

If you want pretty printing (given that the number of lines are same for all the files), then:

paste 1 2 3 4 | column -t

This should do:

paste file_1 file_2 file_3 file_4

If you want pretty printing, then:

paste 1 2 3 4 | column -t

This should do:

paste file_1 file_2 file_3 file_4

If you want pretty printing (given that the number of lines are same for all the files), then:

paste 1 2 3 4 | column -t
2 added 2 characters in body
source | link

This should do:

paste file_1 file_2 file_3 file_4

paste file_1 file_2 file_3 file_4

If you want pretty printing, then:

paste 1 2 3 4 | column -t

This should do:

paste file_1 file_2 file_3 file_4

If you want pretty printing, then:

paste 1 2 3 4 | column -t

This should do:

paste file_1 file_2 file_3 file_4

If you want pretty printing, then:

paste 1 2 3 4 | column -t
1
source | link

This should do:

paste file_1 file_2 file_3 file_4

If you want pretty printing, then:

paste 1 2 3 4 | column -t