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Tech Blog (wh) Techy Things Skip to content Adobe Illustrator App to Fix Linked Files Most Common User Agents Amazon EC2 Alternatives ← Older posts How to install nmap / netcat on Boot2Docker Posted on Sun, 17 May 2015 16:02:23 +0000 boot2docker uses tinycorelinux ( tiny core linux ) for it’s base image – and it is just that – tiny. If you want to add in utilities, you’ll need to use tce-load because this distro doesn’t have apt-get install / aptitude install or yum install What they have instead is tce-load – some information can be found on their install apps page To install nmap you can run: tce-load -wi nmap.tcz I did not see netcat listed on the packages page but I was able to install socat which does the same things as netcat tce-load -wi socat.tcz Posted in Linux | Leave a comment Build Pianobar from Source on Raspberry Pi Raspbian Posted on Thu, 26 Mar 2015 05:50:49 +0000 After getting the TLS handshake Error from pianobar on Raspberry Pi running Debian Wheezy ( aka Raspbian ) I decided to get the latest version of Pianobar. This requires building from sourcecode if you’re on the Wheezy release. The TLS handshake Error can basically be translated to mean “the version of pianobar you’re using is too old” – this is an error that occurs regularly and the solution is always to update to the latest edge version. Packges for Raspbian / Wheezy aren’t going to get updates fast enough for this to be a good option (i.e. to not interrupt your listening ) so you’ll need to build from source. One of the requirements is basically to have ffmpeg ( it the libraries from it ) installed. Several people will suggest installing ffmpeg from source – which you can do – but if you’re using a “Raspberry Pi model B” and not the latest Raspberry Pi 2.0 – or even if you are – it will take a long time to build ffmpeg from source – maybe 6 hours or more. If you go this route, and you’re doing it via SSH make sure to use something like screen to keep the process from dying if you get disconnected. I didn’t want to install ffmpeg and found a good alternative – install the libraries from the backports. Here’s a script – which is basically my notes from along the way. It is sloppy and has some duplication – created from trial and error – but it worked for me and the duplicate packages is not an issue with apt-get ( if one of them is already installed it will be skipped) So, run as root or with sudo. Good luck – report issues on the PromyLOPh github page, or leave a comment if you have any adjustments or tweaks or improvements to the script. #!/bin/bash # script from https://techblog.willshouse.com/?p=5564 # based on notes from: # http://www.mobileread.com/forums/archive/index.php/t-224800.html apt-get install -y debian-keyring debian-archive-keyring if [[ "`grep -c wheezy-backports /etc/apt/sources.list`" -lt 1 ]]; then echo deb http://ftp.us.debian.org/debian wheezy-backports main contrib non-free >> /etc/apt/sources.list echo deb-src http://ftp.us.debian.org/debian wheezy-backports main contrib non-free >> /etc/apt/sources.list fi apt-get update apt-get install -y git libao-dev libgcrypt11-dev libgnutls-dev libfaad-dev libmad0-dev libjson0-dev make pkg-config libevent-pthreads-2.0-5 libao-dev gnutls-dev libmad0-dev libfaad-dev libjson0-dev pkg-config git libao-dev libgcrypt11-dev libgnutls-dev libfaad-dev libmad0-dev libjson0-dev make pkg-config apt-get install -y libgnutls28-dev apt-get -t wheezy-backports install libavfilter-dev libavformat-dev libswscale-dev libavresample-dev -y apt-get -t wheezy-backports install libavfilter-dev libavformat-dev libswscale-dev libavresample-dev libgnutls28-dev -y apt-get install libavcodec-dev libavfilter-dev libavformat-dev alsa-utils -y apt-get install -y alsa-utils # may need to make sure this module is loaded at startup: sudo modprobe snd_bcm2835 cd /usr/src git clone https://github.com/PromyLOPh/pianobar.git cd pianobar make make install Posted in Software | Tagged pandora , pianobar | 1 Comment Connect to Lantronix Spider from Ubuntu RS232 Serial Port or USB Posted on Sun, 25 Jan 2015 18:13:25 +0000 If you need to connect to the Lantronix Spider or SpiderDuo KVM-over-IP Devices via a serial connection, for example to change the configuration or reset the password, you need to use a serial console to do this. I was using an Ubuntu machine with a standard serial / com port ( DB9/RS232 ) and had one of the $4 RJ45 to DB9/RS232 cables To get connected I ended up installing picocom which I like better than using screen as it seems to be more forgiving if something goes wrong and not lock up the system. Then I used the command picocom -b 9600 /dev/ttyS0 to connect to the device and got prompt so I could reset the device: Welcome! Choose a command for the following features: -Initial IP configuration: "config". -Reset device: "reset". [(none) spider]> If you don’t have a RS232 you can also use a ~ $10 USB to RS-232 DB9 Serial Converter in order to get a serial port. The device will show up in /dev/ as something like /dev/ttyUSB0 which will change your picocom command to be: picocom -b 9600 /dev/ttyS0 To exit picocom use control+a, control+x . To install picocom on Ubuntu / Debian linux systems use apt-get install -y picocom A few notes from the Lantronix page : How do I perform the reset? See details on the lantronix page – you will need to use the reset button on the back of the device in combination with a terminal connection described above. What is the default password? Try logging in with the default username, sysadmin , and password, PASS If that does not work, please use the procedure near the top of page 121 of the Spider User Guide I forgot my password. How can I reset the Spider to factory defaults? Use the serial interface with a terminal emulator program set to 9600 or 115200, 8 bit characters, No parity, 1 Stop bit, and No flow control. Within 2 seconds of booting the Spider, press the Esc key a few times to get a => prompt. Type defaults at the => prompt. If you can’t get the => prompt after several tries at 9600, try 115200. Earlier firmware sets the serial console port to 115200 by default. Posted in Server Admin | Tagged rs232 , ubuntu | Leave a comment hombrew: brew install gxargs Posted on Thu, 22 Jan 2015 14:34:12 +0000 The xargs utility on Mac is not the same as the one on linux. In particular, searching for files with the mdfind utility will not properly escape files to be processed. Using homebrew you can install the GNU version of xargs as gxargs , and you can use the syntax you’re accustomed to from GNU/Linux. For me this is equivalent to something like: mdfind -name "conflicted copy" | gxargs -d '\n' -P 4 echo To remove the files you can then replace echo with rm – but be careful! Posted in Mac | Tagged dropbox , homebrew | Leave a comment How to send F2, F8, F9, F12 to a VNC Remote PC from Mac OS X Posted on Sat, 17 Jan 2015 19:48:29 +0000 When recently using Intel Active Management Technology (AMT) I was remotely connected via the RealVNC client, but was having trouble sending keystrokes like F2 to enter the BIOS, F12 to select a startup device, or F8 to access the Windows startup menu. This setup is complicated for a few reasons – first I’m using a Mac keyboard. Secondly, OS X remaps the function keys to do things like dashboard, expose, brightness, and volume by default. After a little searching and trial and error, I found that I can use the free utility included with Mac OS X – AppleScript Editor.app – to send keycodes to the VNC connection. Here’s the code for the applescript you can use to send the F12 key: tell application "VNC Viewer" activate tell application "System Events" to key code 111 end tell This is what it should look like in the editor: To send key combos, like holding down alt and pressing F4, the syntax would be something like this: tell application "System Events" to key code 118 using {command down} We use command instead of alt because that is how Real VNC View...