welcome, you gonna love #!
If you hate systemd devs you are gonna love this:
I have below lines in my dummy.text file. I would like to filter these data using bash script or awk.
Jul 28 15:05:47 * aaa has joined
Jul 28 15:07:47 * bbb has joined
Jul 28 15:08:41 * ccc has joined
Jul 28 15:13:32 * ddd has joined
Jul 28 15:14:40 * eee has joined
For example, let's say aaa has joined the session at time 15:05:47 and ccc joined the session at 15:08:47.