well, i heard from my friend that we can hide the command that we've typed on linux console terminal.eg (when we typed "ls" command the "ls" is not displayed but the console will list all the results of "ls" command). the purpose of this is to try to keep the information on your server a secret if someone's is looking at you typing your command.
i've tried searching google but couldn't find any info on this. I've pretty sure it's a command, or shortcut key that's inside the linux/or unix it's self. any of you know how to do that? thanks in advnce

Your answer lies in the "stty" command :

ahhh .. thanks d00m ..