Grep Regex: List all lines except
Solution 1:
That should do it:
grep -v 'T[^H]'
-v : print lines not matching
[^H]: matches any character but H
Solution 2:
You can do:
grep -v 'T[^H]' input
-v is the inverse match option of grep it does not list the lines that match the pattern.
The regex used is T[^H] which matches any lines that as a T followed by any character other than a H.