- remove below section
00:00:01 kbhugfree kbhugused %hugused
00:01:01 0 0 0.00
00:02:01 0 0 0.00
00:03:01 0 0 0.00
00:04:01 0 0 0.00
00:05:01 0 0 0.00
perl -0pi -e 's;\S+\s+kbhugfree.*(\d\d:\d\d:\d\d\s+\d\s+\d\s+\d\.00)+;;s' filename.txt