Recent Updates:
An introduction to asynchronous programming in Python, including async/await, coroutines, event loops, queues, tasks and more.
A step-by-step tutorial on building a function pointer based state machine.
Blog updates during March 2021.
History, brokers, clients, Mosquitto, Puho and more information about the MQTT communications protocol.
A beginners tutorial on memory allocation in C (malloc(), free(), e.t.c.) for embedded systems.
PROGRAMS
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pdftk can be installed with the following command on Debian-like systems (e.g. Ubuntu):
$ sudo apt-get install pdftk
The following example command reverses some of the pages in the pdf in.pdf. It has over 9 pages, and reverses the direction of pages 3-8.
$ pdftk in.pdf cat 1-2 8-3 9-end output out.pdf