multitail

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

• Tail all files matching a pattern in a single stream:
  multitail -Q 1 '{{pattern}}'
• Tail all files in a directory in a single stream:
  multitail -Q 1 '{{path/to/directory}}/*'
• Automatically add new files to a window:
  multitail -Q {{pattern}}
• Show 5 logfiles while merging 2 and put them in 2 columns with only one in the left column:
  multitail -s 2 -sn 1,3 {{mergefile}} -I {{file1}} {{file2}} {{file3}} {{file4}}