Tag: sudo

fetchmail to get the mails from your imap account

Now, that you have set the RPi to send emails, lets do the next best thing. Setup fetchmail so that we can setup a cron job to run and get us the emails on Raspberry Pi. What can we do with these emails, lots 🙂 (I hope you already have a Raspberry Pi, if not then head over to  element14.)

For now, first install fetchmail:

sudo apt-get install fetchmail

and if you are one of the guys who wants easy configuration then :

sudo apt-get install fetchmailconf

If you are using fetchmailconf, then just fire up “fetchmailconf”. You will get a GUI, where you can configure the setting. If not, then you can create a file “~/.fetchmailrc” which should look something like this:

poll 
protocol IMAP
user "" with password "" mda ""
folder 'INBOX'
fetchlimit 1
# do not delete the mails on server.
keep
# do not re-write the headers for the mail, get saner headers for the script to process.
no rewrite
# use ssl
ssl

 

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nautilis fork ( File manager ) with tree view in sidebar.

Was searching for this for sometime now, finally found it.

sudo yum install nemo
sudo yum list nemo*

First just install nemo. Configure nemo not to interfere with default desktop and also make it default handler. So, here are the settings that would do it.

gconftool-2 --set  /desktop/gnome/applications/component_viewer/exec --type 'string' 'nemo "%s"'
gconftool-2 --set  /desktop/gnome/url-handlers/trash/command --type 'string' 'nemo "%s"'
gsettings set org.nemo.desktop show-desktop-icons false

Now, if you need more functionality in file manager then check the list of nemo packages from the output of second command of yum. It has plugins like file preview and so on. Install and enjoy.

 

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Disable a few cores when you want to save power.

If you have a lot of CPU power and working on battery. If you do not need that much of power and would like to rather save some battery power by disabling some cpus then you can use the below script. This script disables cpus from 4 to 7. You can change the number in the for loop. You would need the sudo to be setup or remove sudo and run the script as root. The script will show you the currently active cpu’s before and after disabling the CPU’s.

If you want to disable to cpus from the grub itself then you can add the below parameter in grub.cfg or grub2.cfg in the vmlinuz line:

1
maxcpus=4

Here is the script:

#!/bin/bash -
#===============================================================================
#
#          FILE: disablecpu.sh
#
#         USAGE: ./disablecpu.sh
#
#   DESCRIPTION:
#
#       OPTIONS: ---
#  REQUIREMENTS: ---
#          BUGS: ---
#         NOTES: ---
#        AUTHOR: Amit Agarwal (aka)
#      REVISION:  ---
#===============================================================================

#set -o nounset                              # Treat unset variables as an error
cat /proc/cpuinfo|grep cores|wc -l
for i in {4..7}
do
    sudo sh -c "echo 0 > /sys/devices/system/cpu/cpu$i/online"
done
cat /proc/cpuinfo|grep cores|wc -l
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