top like tools : Realtime Console Based Info

Tool of the Month: ApacheTop & iftop

top is cool, as are the following based on the same type of output. Read the article

slabtop

"slabtop(1) displays detailed kernel slab cache information in real time. It displays a listing of the top caches sorted by one of the listed sort criterias. It also displays a statistics header filled with slab layer information."

iftop

iftop does for network usage what top(1) does for CPU usage. It listens to network traffic on a named interface and displays a table of current bandwidth usage by pairs of hosts. Handy for answering the question "why is our ADSL link so slow?".

ApacheTop

ApacheTop was written because there are no other realtime tools (that I could find) to display what your Apache server is doing in a concise helpful display.

mytop - a top clone for MySQL

mytop is a console-based (non-gui) tool for monitoring the threads and overall performance of MySQL 3.22.x, 3.23.x, and 4.x servers. It runs on most Unix systems (including Mac OS X) which have Perl, DBI, and Term::ReadKey installed. And with Term::ANSIColor installed you even get color. If you install Time::HiRes, you'll get good real-time queries/second stats. As of version 0.7, it even runs on Windows (somewhat).