Explanations and code for how to enable copy-paste support working in as many terminal applications as possible. Works on a full GUI $DISPLAY, over SSH, on both macOS and Linux, and between ZSH, tmux and Emacs.

Installing the Guix package manager on Android, requires root access.
Note that "Guix complains when /gnu or /gnu/store is a symlink".

chrony is a versatile implementation of the Network Time Protocol (NTP). It can synchronise the system clock with NTP servers, reference clocks (e.g. GPS receiver), and manual input using wristwatch and keyboard. It can also operate as an NTPv4 (RFC 5905) server and peer to provide a time service to other computers in the network.

Linux man pages

Skywave Linux is a 64 bit system, built on a base of Ubuntu 16.04 LTS, uses the MATE desktop environment, and draws on the capabilities of Ubuntu: software updating, graphics, system resource management, etc. It is the additional digital signal processing, networking, and signal decoding applications that set Skywave Linux apart from stock Ubuntu Linux. The default username is skywave and there is no password in the default system.

See also the comments warning against it.

A simple SDR console application
SDR client and server for low bandwidth remote operation
Command line receiver for unattended operation
Transmit support (planned for v2 in 2018)
Primarily targeting Linux desktop and SBCs with limited resources
Written in cross-platform C/C++
Easy deployment thanks to minimal external dependencies

Nanosdr is still a work in progress with initial public release expected around the end of 2017

Explanation of the possible states of a Linux process.

stali is a brand new static linux distribution based on the original pre-2010 plans of the suckless.org project, but with a couple of revised goals:

stali goals
Follow the suckless philosophy
Target x86_64 and arm (RPi) support

Capsicum is a lightweight OS capability and sandbox framework developed at the University of Cambridge Computer Laboratory, supported by grants from Google, the the FreeBSD Foundation, and DARPA. Capsicum extends the POSIX API, providing several new OS primitives to support object-capability security on UNIX-like operating systems:

   capabilities - refined file descriptors with fine-grained rights
   capability mode - process sandboxes that deny access to global namespaces
   process descriptors - capability-centric process ID replacement
   anonymous shared memory objects - an extension to the POSIX shared memory API to support anonymous swap objects associated with file descriptors (capabilities)
   rtld-elf-cap - modified ELF run-time linker to construct sandboxed applications
   libcapsicum - library to create and use capabilities and sandboxed components
   libuserangel - library allowing sandboxed applications or components to interact with user angels, such as Power Boxes.
   chromium-capsicum - a version of Google's Chromium web browser that uses capability mode and capabilities to provide effective sandboxing of high-risk web page rendering.