VIM Quick Tips : Show tab number

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:set guitablabel=%N/\ %t\ %M

Show tab number.


References:
http://vim.wikia.com/wiki/Show_tab_number_in_your_tab_line
Show tab number

apache2: Could not reliably determine the server's fully qualified domain name, using 127.0.1.1 for ServerName

When I try to restart Apache using sudo service apache2 restart I am getting the following message:

 * Restarting web server apache2                                                    apache2: Could not reliably determine the server's fully qualified domain name, using 127.0.1.1 for ServerName
 ... waiting apache2: Could not reliably determine the server's fully qualified domain name, using 127.0.1.1 for ServerName

To get rid of it, I have to add the following in my /etc/hosts file:

127.0.1.1 ubu1210minib.com ubu1210minib

Where ubun1210minib.com ubun1210minib is an arbitrary name I selected. Of course this is not the proper way to fix it as the above information does not properly resolve.  Also need to modify /etc/apache2/sites-enabled/000-default to have a line like:

<VirtualHost *:80>
 ServerAdmin webmaster@localhost
 ServerName ubu1210minib.com

 DocumentRoot /var/www

Note the line that contains ServerName, that should match with the name provided above.

Cleanup or purge configuration files from packages

When removing packages, like sudo apt-get remove virtualbox-guest-utils, it may leave configuration files in the system. This can be verified by running dpkg -l | grep 'virtualbox' for example. If the first string shows rc (removed, configuration files present) then purging is necessary, like so:

$: sudo lshw -class memory

List installed package(s) in Debian based distro

Show installed package that has a string 'virtualbox'

$: dpkg -l | grep 'virtualbox'