Tech Blog (wh)

How to install nmap / netcat on Boot2Docker

2024-04-22T15:01:43Z

boot2docker uses `tinycorelinux` ( [tiny core linux](http://tinycorelinux.net/) ) 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](http://wiki.tinycorelinux.net/wiki:install_apps) page To install nmap you can run: tce-load -wi nmap.tcz I did not see `netcat` listed on the [packages page](ftp://distro.ibiblio.org/tinycorelinux/tce.html) but I was able to install `socat` which does the same things as `netcat` tce-load -wi socat.tcz

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Build Pianobar from Source on Raspberry Pi Raspbian

2024-04-22T15:01:44Z

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 … Continue reading →

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Connect to Lantronix Spider from Ubuntu RS232 Serial Port or USB

2024-04-22T15:01:44Z

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](http://www.amazon.com/Generic-7-Cisco-Console-RJ45-to-DB9/dp/B000GL3MOY/?ie=UTF8&tag=ie-utf-20&qid=1422208990&sr=8-2&keywords=RJ45+to+DB9%2FRS232&pebp=1422208994453&peasin=B000GL3MOY) 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](http://www.amazon.com/TRENDnet-USB-RS-232-Serial-Converter/dp/B0007T27H8/?&ie=UTF8&qid=&tag=ie-utf-20&sr=&keywords=) 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](http://ltxfaq.custhelp.com/app/answers/detail/a_id/1584/~/setting-a-spider-to-factory-defaults-from-the-serial-console-port): ### How do I perform the reset? See details on the [lantronix page](http://ltxfaq.custhelp.com/app/answers/detail/a_id/1688/~/reset-a-spider-to-factory-defaults-using-the-serial-console-port-and-the-reset) – you will need to use the reset button on the back of the device in combination with a terminal connection described above. ### What is … Continue reading →

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hombrew: brew install gxargs

2024-04-22T15:01:44Z

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!

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How to send F2, F8, F9, F12 to a VNC Remote PC from Mac OS X

2024-04-22T15:01:43Z

When recently using [Intel Active Management Technology](http://www.intel.com/content/www/us/en/architecture-and-technology/intel-active-management-technology.html) (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 Viewer translates the “alt” key for a remote windows system by default. To send other keyboard F-keys to the remote Windows machine, use the table below to find the appropriate key – make sure to reference the “Mac” column even if the remote machine is a Windows box. ###What about JAVA? But what happens if you are running a java applet for … Continue reading →

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