http://code.activestate.com/recipes/langs/bash/tags/demo/2013-03-01T19:41:47-08:00ActiveState Code Recipes2013-03-01T19:41:47-08:00Barry Walkerhttp://code.activestate.com/recipes/users/4177147/http://code.activestate.com/recipes/578477-demo-generate-a-crude-1khz-sinewave-using-a-bash-s/

<p style="color: grey"> Bash recipe 578477 by <a href="/recipes/users/4177147/">Barry Walker</a> (<a href="/recipes/tags/audio/">audio</a>, <a href="/recipes/tags/bash/">bash</a>, <a href="/recipes/tags/demo/">demo</a>, <a href="/recipes/tags/generator/">generator</a>, <a href="/recipes/tags/linux/">linux</a>, <a href="/recipes/tags/shell/">shell</a>, <a href="/recipes/tags/sinewave/">sinewave</a>, <a href="/recipes/tags/sound/">sound</a>). </p> <p>A very simple crude sinewave generator using a BASH script inside a Linux Terminal.</p> <p>The file required is generated inside the code and requires /dev/audio to work.</p> <p>Ensure you have this device, if not the download oss-compat from your OS's repository...</p> <p>It lasts for about 8 seconds before exiting and saves a 65536 byte file to your working directory/drawer/folder as sinewave.raw.</p> <p>Use an oscilloscope to check the waveform generated...</p> <p>It is entirely Public Domain and you may do with it as you please...</p> <p>Enjoy finding simple solutions to often very difficult problems... ;o)</p> <p>Bazza, G0LCU...</p>

2013-01-11T18:31:03-08:00Barry Walkerhttp://code.activestate.com/recipes/users/4177147/http://code.activestate.com/recipes/578413-a-shell-binary-to-hexadecimal-to-decimal-demo/

<p style="color: grey"> Bash recipe 578413 by <a href="/recipes/users/4177147/">Barry Walker</a> (<a href="/recipes/tags/apple/">apple</a>, <a href="/recipes/tags/bash/">bash</a>, <a href="/recipes/tags/binary/">binary</a>, <a href="/recipes/tags/decimal/">decimal</a>, <a href="/recipes/tags/demo/">demo</a>, <a href="/recipes/tags/hexadecimal/">hexadecimal</a>, <a href="/recipes/tags/linux/">linux</a>, <a href="/recipes/tags/macbook_pro/">macbook_pro</a>, <a href="/recipes/tags/shell/">shell</a>, <a href="/recipes/tags/terminal/">terminal</a>). </p> <p>This little DEMO may be common knowledge to the big guns but not to amateurs like myself, so......</p> <p>This is an Apple Macbbok Shell/Terminal DEMO shell script to show how to:-</p> <p>1) Create a binary file... 2) Save it to your DEFAULT /directory/drwawer/folder/... 3) Display a hexadecimal dump of said binary file to prove that it is binary... 4) Select a single BYTE of that file and save it as an ASCII text decimal _number_, also to your DEFAULT /directory/drawer/folder/... 5) Read this ASCII text decimal number back in again... 6) Add this string representation to a number... 7) Stop...</p> <p>It was intended purely for OSX 10.7.5 and above using the default terminal and shell...</p> <p>It does work on many Linux flavours and shells/terminals also however.</p> <p>Written so the anyone can understand what is going on.</p> <p>The two files generated and saved in this DEMO to your DEFAULT /directory/drawer/folder/ are:-</p> <p>BinaryString.dat BinaryString.txt</p> <p>This WILL lead to something very unusual in the not too distant future...</p> <p>This is Public Domain and you may do with it as you wish...</p> <p>Enjoy finding simple solutions to often very difficult problems...</p> <p>Bazza, G0LCU...</p>

2013-01-16T12:26:55-08:00Barry Walkerhttp://code.activestate.com/recipes/users/4177147/http://code.activestate.com/recipes/578391-a-demo-6-bit-at-a-glance-colouerd-bargraph-generat/

<p style="color: grey"> Bash recipe 578391 by <a href="/recipes/users/4177147/">Barry Walker</a> (<a href="/recipes/tags/analogue/">analogue</a>, <a href="/recipes/tags/anim/">anim</a>, <a href="/recipes/tags/apple/">apple</a>, <a href="/recipes/tags/bargraph/">bargraph</a>, <a href="/recipes/tags/bash/">bash</a>, <a href="/recipes/tags/beep/">beep</a>, <a href="/recipes/tags/color/">color</a>, <a href="/recipes/tags/colour/">colour</a>, <a href="/recipes/tags/demo/">demo</a>, <a href="/recipes/tags/display/">display</a>, <a href="/recipes/tags/generator/">generator</a>, <a href="/recipes/tags/linux/">linux</a>, <a href="/recipes/tags/macbook_pro/">macbook_pro</a>). Revision 2. </p> <p>This code generates a horizontal coloured real time bargraph generator anim for a Macbook Pro 13 inch, OSX 10.7.5, using the default standard Terminal only.</p> <p>It is UNTESTED on Linux variants but I would like any successful Linux tryers to make a comment in the comments section and tags will be added accordingly otherwise I will assume it does NOT work on other UNIX like variants.</p> <p>It is a derivative of my 7 bit bargraph generator for Python on this site elsewhere.</p> <p>The Terminal colours WILL be changed on running but it is simple to return it back to its original state.</p> <p>Read the code for more information.</p> <p>Enjoy, (and a Happy New Year)...</p> <p>Bazza, G0LCU...</p>