Computing

Computers and information management topics

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Category: Computing
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First, create the file to be used. It should be a single block on the drive. This will create a file (swapfile) of size 100 MB as a large block.

dd if=/dev/zero of=/swapfile bs=1024 count=100000

Next, add the newly created file to the swap pool.

mkswap /swapfile

Finally, turn on the new swapfile.

swapon /swapfile

Now you have 100 more Mbytes of swap memory.

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Category: Computing
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Solution 1

cat /etc/issue

Solution 2

lsb_release -a or cat /etc/lsb-release

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Category: Computing
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Use the update-alternatives command.

In a terminal window and type in the following command:

sudo update-alternatives --config editor

Here's an example of what you'll see:

$ sudo update-alternatives ––config editor

There are 5 alternatives which provide `editor'.


   Selection  Alternative
 ––––––––––––––––––––
            1 /usr/bin/vim
            2 /bin/ed
         *+ 3 /bin/nano
            4 /usr/bin/vim.basic
            5 /usr/bin/vim.tiny
 Press enter to keep the default[*], or type selection number:

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Category: Computing
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dmidecode is a tool for dumping a computer’s DMI (some say SMBIOS) table contents in a human-readable format. Generally this will include all the important hardware in the computer.

lspci is a utility for displaying information about all PCI buses in the system and all devices connected to them. In particular, lspci -vvv can be very useful displaying information about many hardware items in the computer.

Some other basic commands that provide information on the hardware Linux is running on.

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Category: Computing
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At installation Dovecot creates a self-signed certificate that will expire in one year. Often your server installation will be in place longer than this. So, one solution is to create a new certificate that expires in 5 years. To do so follow these instructions.