here is another way to use the 'man' tool:
you can find all the commands, or binaries in these directories:
/bin /sbin /usr/bin /usr/sbin
do "ls /bin" or any of those and you will see all the commands available, now to find out what they do, type "man command" some will not have manual entries though.
I started doing this out of boredom a while ago and it is a good way to find out about commands I did not even know were there.