As per the man page, htop is an ncurses- based process viewer in Linux. It is an improvement over top. In fact, you may stop using top after getting used to htop. It allows you to scroll vertically and horizontally, so that you can see all the processes running on the system along with the commands that initiated the processes. Tasks can be filtered based on user accounts and a process can be killed within htop. This tool displays the output in colour, but the display format of the process details remains the same as in the output of the top command.
The grep command can be used to do the same task, but the performance of look is better. Its other use is that it can check the spelling of a word. Type the first few letters of any word that you want the spelling of and the command will display all the words starting with those letters.
Figure 5: The command