multitail

Extension of tail. More information: https://manned.org/multitail.

multitail -Q 1 'pattern'

multitail -Q 1 'path/to/directory/*'

multitail -Q pattern

multitail -s 2 -sn 1,3 path/to/mergefile -I path/to/file1 path/to/file2 path/to/file3 path/to/file4