Short answer: don't do that.
If you want to run several commands as root, you can use
sudo su - to get a root shell. This is useful if you're doing system maintenance, I personally do this when administering servers.
Other than that, it's a good habit to use
sudo if and only if it's really necessary. This is both for security reasons and you're less likely to mess up your system.
If you find it annoying that you have to type your password too often, you could do a couple of things:
Extend the timeout for
/etc/sudoers (always use this command, never edit it any other way!):
Find the line similar to this one:
Change it like so:
This will make
sudo ask for your password only if you haven't used
sudo for 30 minutes.
sudo not to ask password for specific commands
On one of my systems I use
mount very often and it usually requires root permissions. For convenience, I've set up
sudo so it doesn't require password for the
mount command if you're in the "wheel" group. To achieve this, add a line as such to
/etc/sudoers, again, using
%wheel ALL=(ALL) NOPASSWD: /usr/bin/mount
/usr/bin/mount to whatever command you wish.
If you really, really, really want to use root as your normal user, and you understand the risks, use this tutorial. But again, you could also do it right.