Python as a tftp server

There is a python package called tftpy which implements a tftp client and server. It's more handy for me to set up a temporary tftp server, compared with Fedora's tftp-server package, which relies on systemd.

In order to listen on port 69, python must be running as root. Then, type these lines in the python interactive shell. 

from tftpy import TftpServer

server = TftpServer("tftproot")

serve.listen()

tftproot is the path to the tftproot directory.

Redshift on Fedora 22

Redshift adjusts the screen's color temperature according to the time. It relieves your eyes when working at night. It's homepage is http://jonls.dk/redshift

To install redshift on Fedora 22, type sudo dnf install redshift in terminal. You may also install redshift-gtk, a GUI front-end for gnome desktop. Then you should enable location service in privacy settings. Also add these lines to /etc/geoclue/geoclue.conf to allow redshift to get location from geoclue.

[redshift]
allowed=true
system=false
users=

Finally, type redshift in terminal, and you should notice the change of the color temperature of your screen. However, the shipped systemd service does not work (redshift starts, but no change of color temperature, quite mysterious.) So I installed redshift-gtk and make it autostart when I login.