Root and User
I installed debian on my laptop, and assigned one user. As root I mkdir /home/user_name/program. However when I enter the directory as a user, I'm told that I have no right to save sth. On that note, I'm looking for which command could help me giving write right to the user.
Besides, there are many tty in my /dev. I'd like to make use of one RS-232 port for my application, how could I make sure which tty corresponds to which port?
Thanks in advance,