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Mon 03 August 2015

Update All

To bring your system up to date:

$ sudo apt-get update
$ sudo apt-get upgrade
$ pip list --outdated (then update those)
$ npm update -g
$ sudo rpi-update

Debian Packaged Software

Why have one program that does a few common sense things well when you can have multiple programs that do one or two things really badly!

Program Description
apt-get install: apt-get install <prgm>
  remove: apt-get remove <prgm> add --purge to remove configs
  upgrade: apt-get upgrade <prgm> to get latest
  update: apt-get update updates package databases
apt-cache search for programs you can install: apt-cache search <prgm>
  info: apt-cache showpkg [packagename] displays package info
dpkg list installed: dpkg -l, also search with dpkg -l *blue*
dpkg-query -l same output as above.

Updates, Search, and List

apt-get is a horrible program and a beautiful example of how not to design software. So if you want to know what packages are outdated, then you need to install this package:

sudo apt-get install apt-show-versions

Now to figure out what is outdated, do:

apt-show-versions -u

Now some packages will get kept back which seems to be some strange apt-get issue. To update your system completely, do:

sudo apt-get dist-upgrade

Or list all packages installed on the computer by:

dpkg -l


There is a lot of junk automatically installed on Raspbian, use dpkg -l to see. Suggest removal via sudo apt-get remove <pkg>:

  • isc-dhcp-server: Already have one on my network, don't need another running (it is on by default)
  • sonic-pi: a music programming environment aimed at new programmers
  • printer-driver-*: don't print anything
  • hplip*: HP printing stuff
  • cups cups-bsd cups-client cups-common cups-filters cups-ppdc: printing stuff
  • supercollider*: real-time audio synthesis programming language
  • samba-common: Windoze stuff
  • sane-utils: scanner stuff
  • penguinspuzzle: game
  • ghostscript

Fix GCC/G++

Update to latest complier:

sudo apt-get update
sudo apt-get install gcc-4.8 g++-4.8

To remove gcc/g++ alternative configuration (if there is any, there is none by default):

sudo update-alternatives --remove-all gcc
sudo update-alternatives --remove-all g++

Install alternatives:

sudo update-alternatives --install /usr/bin/gcc gcc /usr/bin/gcc-4.6 20
sudo update-alternatives --install /usr/bin/gcc gcc /usr/bin/gcc-4.8 50
sudo update-alternatives --install /usr/bin/g++ g++ /usr/bin/g++-4.6 20
sudo update-alternatives --install /usr/bin/g++ g++ /usr/bin/g++-4.8 50

Now 4.8 is your default compiler. You can verify it by:

sudo gcc --version

If you want to change it, you can:

sudo update-alternatives --config gcc
sudo update-alternatives --config g++

For gcc 4.8 I use:

gcc-4.8 -mcpu=cortex-a7 -mfpu=neon-vfpv4 -mfloat-abi=hard

To see if binaries are compiling as armv6 or v7, use readelf -a -W.

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