This trick may be obvious, but by combining a couple commands in the Terminal, you can search the descriptions of all the commands in that path. Open a Terminal and type:
% whatis /usr/bin/* | grep "search string"This will return the description of every command in that path and then filter it with your search string. This is a quick way to find a way of doing something, if you don't know all the commands. For example:
% whatis /usr/bin/* | grep "memory"These example results were trimmed for width, but you get the idea...
leaks(1) - Search a process's memory for...
vm_stat(1) - show Mach virtual memory statistics
vmmap(1) - Display the virtual memory regions...
Mac OS X Hints
http://hints.macworld.com/article.php?story=20020412083444156