I'm a brand new user so I'm not sure of my way around the system yet. I want to change my computer's name, so I tried to edit the name in
/etc/hostname, but it is a read-only file. Adding the
! character didn't help. I'm using
vim to edit the file.
Changing system settings requires superuser permissions. From a terminal, do
sudo <editor> <filename>
where could be vim or nano or any other editor command, and is the one you need to edit.
You could also use
gksudo gedit <filename>.
In either case you will be prompted for password of a user with superuser permissions - in a normal Ubuntu installation this would be the first user created during installation.
If you are editing a file without
sudo, and you need
sudo in order to save, simply use this vim command:
:w !sudo tee %
Credit to Dr Beco. Note that vim will notice the file change and ask you if you want to (L)oad the changes, press L.
Very Short Answer:
You can modify a file (even if it's read-only) if you own it.
Even if the user which you are logged in as (in this case
navid) has administrative privileges, you won't be able to modify
/etc/hostname, because the
root user owns that file. Consequently, you should log in as the root user.
Assuming that you want to change your computer name from
newName, here are the steps that you should follow:
Log in as the root user:
navid@oldName:~$ sudo su -
root@oldName:~# vi /etc/hostname
You will see
oldName. Press i to go to the insert mode then change it to
newName. Then press Esc + : + w + q + Enter to save and exit.
root@oldName:~# vi /etc/hosts
The top 2 lines look like this:
127.0.0.1 localhost 127.0.1.1 oldName
Similarly to what you did in step 3, change the computer name from
newName. Then save and exit.
Exit the root user:
Save all of your unsaved work and restart your computer:
Open your terminal, and you will see that your computer name has successfully been changed! :-)
Note: Although you may achieve what you want by skipping steps 4 and 5, I strongly recommend doing them as well, to avoid potential errors in the future.
By default you have wight permission to hosts file to root user only, as shown below:
-rw-r--r-- 1 root root 252 Dec 16 08:40 /etc/hosts
Hence you have to use sudo to edit this or else you can use below command to become root
sudo su -
however this is not recommended at all.
safest and recommended it you use below command to edit the file
sudo vim /etc/hosts
then press "Esc" on keyboard and then type ":w!" to write the changes to the hosts file then agin type ":q" or ":q!", this should shall do the trick for you.