Based on the Host communication instructions, but with a tweak for when the usb0 address is not found:
$ /sbin/ip link set usb0 up
Cannot find device "usb0"Because of the predictable network interface name scheme, though, usb0 may be renamed to something else:
| #!/usr/bin/env python | |
| """ | |
| A ternary search tree implementation, inspired by: | |
| http://www.drdobbs.com/database/ternary-search-trees/184410528 and | |
| https://lukaszwrobel.pl/blog/ternary-search-tree/ | |
| https://github.com/djtrack16/tst/blob/master/ternarysearchtree.py | |
| """ |
| #!/usr/bin/env python | |
| """ | |
| A binary search tree implementation, from: | |
| "Python Algorithms: Mastering Basic Algorithms in the Python Language" | |
| by Magnus Lie Hetland | |
| ISBN: 9781484200551 |
| #include <stdio.h> | |
| #include <stdlib.h> | |
| #include <unistd.h> | |
| #include <sys/time.h> | |
| #include <pthread.h> | |
| void *listen(void *timestamp) { | |
| int c; | |
| while((c = getc(stdin)) != EOF) { | |
| if( c == '\n' ) { |
| package main | |
| import ( | |
| "bufio" | |
| "fmt" | |
| "math/rand" | |
| "os" | |
| "time" | |
| ) |
| /* This is a scala solution for a mini domain specific language (DSL) | |
| * defining instructions for populating an empty matrix. | |
| * | |
| * Input consists of a single string separated by spaces: | |
| * - the first number represents the size of the matrix, NxN | |
| * - the rest of the input consists of one or more strings defining | |
| * the range of cells and how each of their populations will be | |
| * incremented | |
| * | |
| * Increment pattern possibilities: |
SchemaSpy is a neat tool to produce visual diagrams for most relational databases.
Here's how to use it to generate schema relationship diagrams for PostgreSQL databases:
Download the jar file from here (the current version is v6.1.0)
Get the PostgreSQL JDBC driver (unless your installed version of java is really old, use the latest JDBC4 jar file)
Run the command against an existing database. For most databases, the schema (-s option) we are interested in is the public one:
| apt-get install -y build-essential \ | |
| # development \ | |
| git mercurial roxterm curl gawk \ | |
| libpcre3-dev libssl-dev \ | |
| qt4-dev-tools libqt4-dev libqt4-core libqt4-gui libqt4-opengl libqt4-network \ | |
| libssl-dev libdb5.1++-dev libboost-all-dev libqrencode-dev libminiupnpc-dev \ | |
| python-all-dev python-lxml python-magic python-imaging python-pip python-pandas \ | |
| erlang \ | |
| # word processing \ | |
| texlive-latex-base latex2rtf texlive-full \ |
The Raspberry Pi Model A+ has just a single usb port, so getting the wifi configured has to done by editing /etc/network/interfaces from a command line prompt.
These instructions assume the Raspbian OS on the SD card, and a usb wifi adapter that supports the RTL8192cu chipset, since the current Raspbian has built-in support for it.