alias command
 

is there any specific directory to create and store alias commands or should i just use my root directory? thanks

Create and store aliases in a directory? Who have you been talking to?? :)

I assume you mean an alias for commands. For instance, typing "ll" at the command prompt, and expecting it to execute "ls -l". Those aliases aren't stored as files; they're settings in your ~/.bashrc (normally). Just open ~/.bashrc in a text editor, and define whatever aliases you want. To continue the example I mentioned earlier, you would add a line like this to your ~/.bashrc:
The next time you login, the aliases will be set automatically.

lord helmet, good work. i type the bash command but 'don't have permission'. it's my computer so i know i have administrator privileges but how do i get around this? thanks.

Ok, you lost me. What command are you trying to execute, and what's the error message?