Did a search for help on clearing up Ubuntu’s Cache System as my system keeps using up my memory for cache system. Though using up my memory for cache doesn’t actually hinder my system’s operation, I find it quite irritating to see it being used up even though I have 8GB of RAM. This command should work for most Debian based Linux Operating System, but I haven’t try them as I don’t own any now. Here is the link to the document.
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Ubuntu Server is like any Linux variety, and has full multi-user capabilities, and a common task on any server is adding users.
useradd
The useradd command will let you add a new user easily from the command line:
useradd
This command adds the user, but without any extra options your user won’t have a password or a home directory.
You can use the -d option to set the home directory for the user. The -m option will force useradd to create the home directory. We’ll try creating a user account with those options, and then use the passwd command to set the password for the account. You can alternatively set a password using -p on the useradd command, but I prefer to set the password using passwd.
sudo useradd -d /home/testuser -m testuser
sudo passwd testuser
adduser
The adduser command is even easier than the useradd command, because it prompts you for each piece of information. I find it slightly funny that there are two virtually identically named commands that do the same thing, but that’s linux for you. Here’s the syntax:
adduser
Here is how you add an user to ftp server on Ubuntu LAMP (Linux, Apache, MySQL, PHP).
chown username /var/www/username
or chown username /var/www
