htop (interactive process viewer) Linux Performance Monitoring tool

htop is a interactive process viewer in UNIX like operating system.Htop is a free (GPL) ncurses-based process viewer for Linux.It is similar to top, but allows you to scroll vertically and horizontally, so you can see all the processes running on the system, along with their full command lines.Tasks related to processes (killing, renicing) can be done without entering their PIDs.