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Calculating performance of outdoor wireless network links<\/a><\/blockquote><\/iframe><script type=\"text\/javascript\">\n\/* <![CDATA[ *\/\n\/*! 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content</a></div> <button class="menu-toggle">☰</button> </nav> </header> <div id="main" class="site-main"> <div id="primary" class="content-area"> <div id="content" class="site-content" role="main"> <article id="post-1115" class="post-1115 post type-post status-publish format-standard hentry category-audio category-electronics category-radio tag-alan-turing tag-enigma tag-gbr tag-hidden-message tag-interference tag-mike-oldfield tag-morse-code tag-rugby-radio-station tag-scotland tag-tubular-bells tag-y-service"> <header class="entry-header"> <h1 class="entry-title"><a href="https://madpsy.uk/link-between-the-soundtrack-of-the-exorcist-and-amateur-radio/" title="Permalink to Hidden Morse Code in Tubular Bells" rel="bookmark">Hidden Morse Code in Tubular Bells</a></h1> <div class="entry-meta"> Posted on <a href="https://madpsy.uk/link-between-the-soundtrack-of-the-exorcist-and-amateur-radio/" title="23:32" rel="bookmark"><time class="entry-date" datetime="2021-10-31T23:32:00+00:00" pubdate>October 31, 2021</time></a><span class="byline"> by <span class="author vcard"><a class="url fn n" href="https://madpsy.uk/author/nathan/" title="View all posts by MadPsy" rel="author">MadPsy</a></span></span> </div> </header> <div class="entry-content"> <p>The link between The Exorcist, Amateur Radio and Alan Turing.</p> <p>A quick look at how the movie The Exorcist from 1973 has links to the late great Alan Turing via Mike Oldfield’s album Tubular Bells, Scotland and Amateur Radio. It’s Halloween so figured why not throw some horror in the mix.</p> <figure class="wp-block-gallery has-nested-images columns-default is-cropped wp-block-gallery-1 is-layout-flex wp-block-gallery-is-layout-flex"> <figure class="wp-block-image size-large"><img fetchpriority="high" decoding="async" width="861" height="314" data-id="1318" src="https://madpsy.uk/wp-content/uploads/2022/05/logo_hidden_morse.png" alt="" class="wp-image-1318" srcset="https://madpsy.uk/wp-content/uploads/2022/05/logo_hidden_morse.png 861w, https://madpsy.uk/wp-content/uploads/2022/05/logo_hidden_morse-300x109.png 300w, https://madpsy.uk/wp-content/uploads/2022/05/logo_hidden_morse-768x280.png 768w" sizes="(max-width: 861px) 100vw, 861px" /></figure> </figure> <p>When Mike Oldfield recorded Tubular Bells in 1973 he had no idea his first album on Virgin Records would be chosen as the soundtrack to The Exorcist later that year. Neither did he know that recording with Virgin Records would have an unintended consequence of hiding a secret message which dates back to 1926, shortly after World War One.</p> <a href="https://madpsy.uk/link-between-the-soundtrack-of-the-exorcist-and-amateur-radio/#more-1115" class="more-link">Read More <span class="meta-nav">»</span></a> </div> <footer class="entry-meta"> <span class="cat-links"> Filed Under: <a href="https://madpsy.uk/category/audio/" rel="category tag">Audio</a>, <a href="https://madpsy.uk/category/electronics/" rel="category tag">Electronics</a>, <a href="https://madpsy.uk/category/radio/" rel="category tag">Radio</a> </span> <span class="sep"> | </span> <span class="tag-links"> Tagged: <a href="https://madpsy.uk/tag/alan-turing/" rel="tag">alan turing</a>, <a href="https://madpsy.uk/tag/enigma/" rel="tag">enigma</a>, <a href="https://madpsy.uk/tag/gbr/" rel="tag">GBR</a>, <a href="https://madpsy.uk/tag/hidden-message/" rel="tag">hidden message</a>, <a href="https://madpsy.uk/tag/interference/" rel="tag">interference</a>, <a href="https://madpsy.uk/tag/mike-oldfield/" rel="tag">mike oldfield</a>, <a href="https://madpsy.uk/tag/morse-code/" rel="tag">morse code</a>, <a href="https://madpsy.uk/tag/rugby-radio-station/" rel="tag">rugby radio station</a>, <a href="https://madpsy.uk/tag/scotland/" rel="tag">scotland</a>, <a href="https://madpsy.uk/tag/tubular-bells/" rel="tag">tubular bells</a>, <a href="https://madpsy.uk/tag/y-service/" rel="tag">y service</a> </span> <span class="sep"> | </span> <span class="comments-link"><a href="https://madpsy.uk/link-between-the-soundtrack-of-the-exorcist-and-amateur-radio/#comments">4 Comments</a></span> </footer> </article> <article id="post-1098" class="post-1098 post type-post status-publish format-standard hentry category-radio category-uncategorized tag-auto-update tag-radio tag-slow-scan tag-sstv tag-tv"> <header class="entry-header"> <h1 class="entry-title"><a href="https://madpsy.uk/live-sstv-images/" title="Permalink to Latest SSTV Images (auto updates!)" rel="bookmark">Latest SSTV Images (auto updates!)</a></h1> <div class="entry-meta"> Posted on <a href="https://madpsy.uk/live-sstv-images/" title="20:00" rel="bookmark"><time class="entry-date" datetime="2021-07-30T20:00:10+01:00" pubdate>July 30, 2021</time></a><span class="byline"> by <span class="author vcard"><a class="url fn n" href="https://madpsy.uk/author/nathan/" title="View all posts by MadPsy" rel="author">MadPsy</a></span></span> </div> </header> <div class="entry-content"> <figure class="wp-block-image size-full is-resized"><img decoding="async" src="https://madpsy.uk/wp-content/uploads/2021/07/Moderni_SSTV.jpg" alt="" class="wp-image-1108" width="549" height="408" srcset="https://madpsy.uk/wp-content/uploads/2021/07/Moderni_SSTV.jpg 319w, https://madpsy.uk/wp-content/uploads/2021/07/Moderni_SSTV-300x223.jpg 300w" sizes="(max-width: 549px) 100vw, 549px" /></figure> <p>The Slow Scan TV images below will update every 30 seconds if I’m running the reciever for them. You never know what you might see so is kinda cool to see them appear in real time. I’m showing the last 20 images which have been decoded, usually from either 20m or 40m bands.</p> <p>Slow-scan television (SSTV) is a picture transmission method, used mainly by amateur radio operators, to transmit and receive static pictures via radio in monochrome or color.</p> <p>A literal term for SSTV is narrowband television. Analog broadcast television requires at least 6 MHz wide channels, because it transmits 25 or 30 picture frames per second (in the NTSC, PAL or SECAM color systems), but SSTV usually only takes up to a maximum of 3 kHz of bandwidth. It is a much slower method of still picture transmission, usually taking from about eight seconds to a couple of minutes, depending on the mode used, to transmit one image frame.</p> <p>Since SSTV systems operate on voice frequencies, amateurs use it on shortwave (also known as HF by amateur radio operators), VHF and UHF radio.</p> <a href="https://madpsy.uk/live-sstv-images/#more-1098" class="more-link">Read More <span class="meta-nav">»</span></a> </div> <footer class="entry-meta"> <span class="cat-links"> Filed Under: <a href="https://madpsy.uk/category/radio/" rel="category tag">Radio</a>, <a href="https://madpsy.uk/category/uncategorized/" rel="category tag">Uncategorized</a> </span> <span class="sep"> | </span> <span class="tag-links"> Tagged: <a href="https://madpsy.uk/tag/auto-update/" rel="tag">auto update</a>, <a href="https://madpsy.uk/tag/radio/" rel="tag">Radio</a>, <a href="https://madpsy.uk/tag/slow-scan/" rel="tag">slow scan</a>, <a href="https://madpsy.uk/tag/sstv/" rel="tag">sstv</a>, <a href="https://madpsy.uk/tag/tv/" rel="tag">tv</a> </span> </footer> </article> <article id="post-971" class="post-971 post type-post status-publish format-standard hentry category-electronics category-radio tag-222 tag-d1-mini tag-esp8266 tag-ftdx10 tag-ftdx101 tag-ftdx101d tag-home-assistant tag-tasmota tag-transmit tag-tx-sense tag-yaesu"> <header class="entry-header"> <h1 class="entry-title"><a href="https://madpsy.uk/yaesu-857-897-wifi-tx-sensor-for-home-assistant/" title="Permalink to Yaesu WiFi TX and Voltage Sensor for Home Assistant" rel="bookmark">Yaesu WiFi TX and Voltage Sensor for Home Assistant</a></h1> <div class="entry-meta"> Posted on <a href="https://madpsy.uk/yaesu-857-897-wifi-tx-sensor-for-home-assistant/" title="17:52" rel="bookmark"><time class="entry-date" datetime="2021-05-14T17:52:08+01:00" pubdate>May 14, 2021</time></a><span class="byline"> by <span class="author vcard"><a class="url fn n" href="https://madpsy.uk/author/nathan/" title="View all posts by MadPsy" rel="author">MadPsy</a></span></span> </div> </header> <div class="entry-content"> <p>A simple and quick project for detecting when a Yaesu transciever is transmitting and feed that status to Home Assistant to then perform actions. This can be used to, for example, automate killing the power if the radio gets stuck TX’ing when using automated digital modes software such as WSJT-X remotely. It can also measure the supply voltage, which is always useful information to know, especially when operating remotely.</p> <figure class="wp-block-gallery columns-2 is-cropped wp-block-gallery-2 is-layout-flex wp-block-gallery-is-layout-flex"><ul class="blocks-gallery-grid"><li class="blocks-gallery-item"><figure><img decoding="async" width="1024" height="768" src="https://madpsy.uk/wp-content/uploads/2021/05/4096-3079-max-1024x768.jpg" alt="" data-id="1039" data-full-url="https://madpsy.uk/wp-content/uploads/2021/05/4096-3079-max-scaled.jpg" data-link="https://madpsy.uk/yaesu-857-897-wifi-tx-sensor-for-home-assistant/4096-3079-max/#main" class="wp-image-1039" srcset="https://madpsy.uk/wp-content/uploads/2021/05/4096-3079-max-1024x768.jpg 1024w, https://madpsy.uk/wp-content/uploads/2021/05/4096-3079-max-300x225.jpg 300w, https://madpsy.uk/wp-content/uploads/2021/05/4096-3079-max-768x576.jpg 768w, https://madpsy.uk/wp-content/uploads/2021/05/4096-3079-max-1536x1152.jpg 1536w, https://madpsy.uk/wp-content/uploads/2021/05/4096-3079-max-2048x1536.jpg 2048w" sizes="(max-width: 1024px) 100vw, 1024px" /></figure></li><li class="blocks-gallery-item"><figure><img loading="lazy" decoding="async" width="1024" height="768" src="https://madpsy.uk/wp-content/uploads/2021/05/4096-3072-max-1024x768.jpg" alt="" data-id="1040" data-full-url="https://madpsy.uk/wp-content/uploads/2021/05/4096-3072-max-scaled.jpg" data-link="https://madpsy.uk/yaesu-857-897-wifi-tx-sensor-for-home-assistant/4096-3072-max/#main" class="wp-image-1040" srcset="https://madpsy.uk/wp-content/uploads/2021/05/4096-3072-max-1024x768.jpg 1024w, https://madpsy.uk/wp-content/uploads/2021/05/4096-3072-max-300x225.jpg 300w, https://madpsy.uk/wp-content/uploads/2021/05/4096-3072-max-768x576.jpg 768w, https://madpsy.uk/wp-content/uploads/2021/05/4096-3072-max-1536x1152.jpg 1536w, https://madpsy.uk/wp-content/uploads/2021/05/4096-3072-max-2048x1536.jpg 2048w" sizes="(max-width: 1024px) 100vw, 1024px" /></figure></li></ul></figure> <a href="https://madpsy.uk/yaesu-857-897-wifi-tx-sensor-for-home-assistant/#more-971" class="more-link">Read More <span class="meta-nav">»</span></a> </div> <footer class="entry-meta"> <span class="cat-links"> Filed Under: <a href="https://madpsy.uk/category/electronics/" rel="category tag">Electronics</a>, <a href="https://madpsy.uk/category/radio/" rel="category tag">Radio</a> </span> <span class="sep"> | </span> <span class="tag-links"> Tagged: <a href="https://madpsy.uk/tag/897/" rel="tag">897</a>, <a href="https://madpsy.uk/tag/d1-mini/" rel="tag">d1 mini</a>, <a href="https://madpsy.uk/tag/esp8266/" rel="tag">esp8266</a>, <a href="https://madpsy.uk/tag/ftdx10/" rel="tag">ftdx10</a>, <a href="https://madpsy.uk/tag/ftdx101/" rel="tag">ftdx101</a>, <a href="https://madpsy.uk/tag/ftdx101d/" rel="tag">ftdx101d</a>, <a href="https://madpsy.uk/tag/home-assistant/" rel="tag">home assistant</a>, <a href="https://madpsy.uk/tag/tasmota/" rel="tag">tasmota</a>, <a href="https://madpsy.uk/tag/transmit/" rel="tag">transmit</a>, <a href="https://madpsy.uk/tag/tx-sense/" rel="tag">tx sense</a>, <a href="https://madpsy.uk/tag/yaesu/" rel="tag">yaesu</a> </span> </footer> </article> <article id="post-895" class="post-895 post type-post status-publish format-standard hentry category-radio tag-awards tag-dmc tag-ft8"> <header class="entry-header"> <h1 class="entry-title"><a href="https://madpsy.uk/ft8-dmc-awards/" title="Permalink to FT8 DMC Awards" rel="bookmark">FT8 DMC Awards</a></h1> <div class="entry-meta"> Posted on <a href="https://madpsy.uk/ft8-dmc-awards/" title="09:33" rel="bookmark"><time class="entry-date" datetime="2021-05-14T09:33:59+01:00" pubdate>May 14, 2021</time></a><span class="byline"> by <span class="author vcard"><a class="url fn n" href="https://madpsy.uk/author/nathan/" title="View all posts by MadPsy" rel="author">MadPsy</a></span></span> </div> </header> <div class="entry-content"> <p>All my FT8 Awards from <a href="https://ft8dmc.eu/" target="_blank" rel="noreferrer noopener">https://ft8dmc.eu/</a></p> <figure class="wp-block-image size-large"><img loading="lazy" decoding="async" width="1024" height="717" src="https://madpsy.uk/wp-content/uploads/2021/05/MM3NDH-WAC-WAC_FT8DMC-1-1024x717.jpg" alt="" class="wp-image-1283" srcset="https://madpsy.uk/wp-content/uploads/2021/05/MM3NDH-WAC-WAC_FT8DMC-1-1024x717.jpg 1024w, https://madpsy.uk/wp-content/uploads/2021/05/MM3NDH-WAC-WAC_FT8DMC-1-300x210.jpg 300w, https://madpsy.uk/wp-content/uploads/2021/05/MM3NDH-WAC-WAC_FT8DMC-1-768x537.jpg 768w, https://madpsy.uk/wp-content/uploads/2021/05/MM3NDH-WAC-WAC_FT8DMC-1-1536x1075.jpg 1536w, https://madpsy.uk/wp-content/uploads/2021/05/MM3NDH-WAC-WAC_FT8DMC-1.jpg 1772w" sizes="(max-width: 1024px) 100vw, 1024px" /></figure> <a href="https://madpsy.uk/ft8-dmc-awards/#more-895" class="more-link">Read More <span class="meta-nav">»</span></a> </div> <footer class="entry-meta"> <span class="cat-links"> Filed Under: <a href="https://madpsy.uk/category/radio/" rel="category tag">Radio</a> </span> <span class="sep"> | </span> <span class="tag-links"> Tagged: <a href="https://madpsy.uk/tag/awards/" rel="tag">awards</a>, <a href="https://madpsy.uk/tag/dmc/" rel="tag">dmc</a>, <a href="https://madpsy.uk/tag/ft8/" rel="tag">ft8</a> </span> </footer> </article> <article id="post-849" class="post-849 post type-post status-publish format-standard hentry category-radio tag-amateur-radio tag-digital-modes tag-ft8 tag-how-to tag-wsjt-x"> <header class="entry-header"> <h1 class="entry-title"><a href="https://madpsy.uk/ft8-set-up-and-tips/" title="Permalink to FT8: How to configure WSJT-X and useful tips" rel="bookmark">FT8: How to configure WSJT-X and useful tips</a></h1> <div class="entry-meta"> Posted on <a href="https://madpsy.uk/ft8-set-up-and-tips/" title="13:44" rel="bookmark"><time class="entry-date" datetime="2020-07-18T13:44:28+01:00" pubdate>July 18, 2020</time></a><span class="byline"> by <span class="author vcard"><a class="url fn n" href="https://madpsy.uk/author/nathan/" title="View all posts by MadPsy" rel="author">MadPsy</a></span></span> </div> </header> <div class="entry-content"> <p>At almost 1000 QSOs with FT8 using WSJT-X I thought I’d share a quick set up guide and some tips.</p> <figure class="wp-block-image size-large"><img loading="lazy" decoding="async" width="818" height="363" src="https://madpsy.uk/wp-content/uploads/2020/07/0.png" alt="" class="wp-image-864" srcset="https://madpsy.uk/wp-content/uploads/2020/07/0.png 818w, https://madpsy.uk/wp-content/uploads/2020/07/0-300x133.png 300w, https://madpsy.uk/wp-content/uploads/2020/07/0-768x341.png 768w" sizes="(max-width: 818px) 100vw, 818px" /></figure> <p></p> <p>I won’t go into TX here, only RX for now.</p> <p> <a href="https://madpsy.uk/ft8-set-up-and-tips/#more-849" class="more-link">Read More <span class="meta-nav">»</span></a></p> </div> <footer class="entry-meta"> <span class="cat-links"> Filed Under: <a href="https://madpsy.uk/category/radio/" rel="category tag">Radio</a> </span> <span class="sep"> | </span> <span class="tag-links"> Tagged: <a href="https://madpsy.uk/tag/amateur-radio/" rel="tag">amateur radio</a>, <a href="https://madpsy.uk/tag/digital-modes/" rel="tag">digital modes</a>, <a href="https://madpsy.uk/tag/ft8/" rel="tag">ft8</a>, <a href="https://madpsy.uk/tag/how-to/" rel="tag">how to</a>, <a href="https://madpsy.uk/tag/wsjt-x/" rel="tag">wsjt-x</a> </span> <span class="sep"> | </span> <span class="comments-link"><a href="https://madpsy.uk/ft8-set-up-and-tips/#comments">1 Comment</a></span> </footer> </article> <article id="post-663" class="post-663 post type-post status-publish format-standard hentry category-networking category-radio tag-2-4ghz tag-5ghz tag-802-11 tag-fresnel tag-long-distance tag-outdoor tag-wifi tag-wireless-network"> <header class="entry-header"> <h1 class="entry-title"><a href="https://madpsy.uk/calculating-performance-of-outdoor-wireless-network-links/" title="Permalink to Calculating performance of outdoor wireless network links" rel="bookmark">Calculating performance of outdoor wireless network links</a></h1> <div class="entry-meta"> Posted on <a href="https://madpsy.uk/calculating-performance-of-outdoor-wireless-network-links/" title="14:07" rel="bookmark"><time class="entry-date" datetime="2017-01-15T14:07:36+00:00" pubdate>January 15, 2017</time></a><span class="byline"> by <span class="author vcard"><a class="url fn n" href="https://madpsy.uk/author/nathan/" title="View all posts by MadPsy" rel="author">MadPsy</a></span></span> </div> </header> <div class="entry-content"> <p>This article contains information on how to calculate the operating margin of a wireless 802.11 network using a known distance between the two points.</p> <p><img loading="lazy" decoding="async" class="alignnone size-full wp-image-664" src="/wp-content/uploads/2017/01/fresnel.gif" alt="fresnel" width="400" height="159" /></p> <p>I wrote this quite a while ago and although the throughput of wireless links has dramatically increased the basic theory still applies. Of course we now have 5GHz available, which is very useful for this application. You should be able to substitute ‘f’ for 5000MHz and the maths will still work.</p> <p>You can now get a 150mbps PTP link over 15km using equipment that costs £160 for <em>both</em> ends – that’s the entire cost of the system (minus a couple of poles and brackets). Crazy value for money when you think about it. The Ubiquiti NSM5 NanoStation is one such example. The Ubiquiti product range is pretty impressive to say the least. The NSM5 seen below is the big brother of the LOCOM5, which at £125 can still do 10km at the same rate and are around half the size.</p> <p><img loading="lazy" decoding="async" class="size-full wp-image-666 aligncenter" src="/wp-content/uploads/2017/01/nsm5-kit.png" alt="nsm5-kit" width="400" height="400" srcset="https://madpsy.uk/wp-content/uploads/2017/01/nsm5-kit.png 400w, https://madpsy.uk/wp-content/uploads/2017/01/nsm5-kit-150x150.png 150w, https://madpsy.uk/wp-content/uploads/2017/01/nsm5-kit-300x300.png 300w" sizes="(max-width: 400px) 100vw, 400px" /></p> <p> </p> <p>If you are considering an outdoor wireless link, give this article a read so you understand how high above objects you need to mount your shiny new kit!</p> <p> <a href="https://madpsy.uk/calculating-performance-of-outdoor-wireless-network-links/#more-663" class="more-link">Read More <span class="meta-nav">»</span></a></p> </div> <footer class="entry-meta"> <span class="cat-links"> Filed Under: <a href="https://madpsy.uk/category/networking/" rel="category tag">Networking</a>, <a href="https://madpsy.uk/category/radio/" rel="category tag">Radio</a> </span> <span class="sep"> | </span> <span class="tag-links"> Tagged: <a href="https://madpsy.uk/tag/2-4ghz/" rel="tag">2.4ghz</a>, <a href="https://madpsy.uk/tag/5ghz/" rel="tag">5ghz</a>, <a href="https://madpsy.uk/tag/802-11/" rel="tag">802.11</a>, <a href="https://madpsy.uk/tag/fresnel/" rel="tag">fresnel</a>, <a href="https://madpsy.uk/tag/long-distance/" rel="tag">long distance</a>, <a href="https://madpsy.uk/tag/outdoor/" rel="tag">outdoor</a>, <a href="https://madpsy.uk/tag/wifi/" rel="tag">wifi</a>, <a href="https://madpsy.uk/tag/wireless-network/" rel="tag">wireless network</a> </span> </footer> </article> <article id="post-619" class="post-619 post type-post status-publish format-standard hentry category-internet category-linux"> <header class="entry-header"> <h1 class="entry-title"><a href="https://madpsy.uk/json-parsing-nagios-script/" title="Permalink to JSON Parsing Nagios Script" rel="bookmark">JSON Parsing Nagios Script</a></h1> <div class="entry-meta"> Posted on <a href="https://madpsy.uk/json-parsing-nagios-script/" title="15:08" rel="bookmark"><time class="entry-date" datetime="2016-10-30T15:08:47+00:00" pubdate>October 30, 2016</time></a><span class="byline"> by <span class="author vcard"><a class="url fn n" href="https://madpsy.uk/author/nathan/" title="View all posts by MadPsy" rel="author">MadPsy</a></span></span> </div> </header> <div class="entry-content"> <p>Parsing JSON in Bash is never usually the best idea but sometimes it may be necessary or preferred. Here’s a nice easy script which uses the ‘jq’ command to perform JSON parsing in Bash.</p> <p><img loading="lazy" decoding="async" class="alignnone size-full wp-image-638" src="https://madpsy.uk/wp-content/uploads/2016/10/imgres.png" alt="imgres" width="357" height="141" srcset="https://madpsy.uk/wp-content/uploads/2016/10/imgres.png 357w, https://madpsy.uk/wp-content/uploads/2016/10/imgres-300x118.png 300w" sizes="(max-width: 357px) 100vw, 357px" /></p> <p>Let’s imagine you have the following JSON which is outputted by a stats gathering process:</p> <pre>{"web_rate":1,"db_rate":2,"php_rate":2}</pre> <p>Parsing that in Bash by writing some regex’s etc is perfecting possible but there’s an infinitely easier way. Welcome to ‘jq’. Let’s see it in action.</p> <p> <a href="https://madpsy.uk/json-parsing-nagios-script/#more-619" class="more-link">Read More <span class="meta-nav">»</span></a></p> </div> <footer class="entry-meta"> <span class="cat-links"> Filed Under: <a href="https://madpsy.uk/category/internet/" rel="category tag">Internet</a>, <a href="https://madpsy.uk/category/linux/" rel="category tag">Linux</a> </span> <span class="sep"> | </span> <span class="comments-link"><a href="https://madpsy.uk/json-parsing-nagios-script/#comments">1 Comment</a></span> </footer> </article> <article id="post-602" class="post-602 post type-post status-publish format-standard hentry category-linux"> <header class="entry-header"> <h1 class="entry-title"><a href="https://madpsy.uk/useful-to-know-bash-parameters/" title="Permalink to Useful to know Bash parameters" rel="bookmark">Useful to know Bash parameters</a></h1> <div class="entry-meta"> Posted on <a href="https://madpsy.uk/useful-to-know-bash-parameters/" title="14:46" rel="bookmark"><time class="entry-date" datetime="2016-10-30T14:46:09+00:00" pubdate>October 30, 2016</time></a><span class="byline"> by <span class="author vcard"><a class="url fn n" href="https://madpsy.uk/author/nathan/" title="View all posts by MadPsy" rel="author">MadPsy</a></span></span> </div> </header> <div class="entry-content"> <p>Even having written many hundreds of Bash scripts over the years I sometimes forget the basic special parameters which are available. For that reason I’ve made this post which is a copy of the page from gnu.org.</p> <p><img loading="lazy" decoding="async" class="alignnone size-full wp-image-636" src="https://madpsy.uk/wp-content/uploads/2016/10/bash-logo-web.png" alt="bash-logo-web" width="376" height="158" srcset="https://madpsy.uk/wp-content/uploads/2016/10/bash-logo-web.png 376w, https://madpsy.uk/wp-content/uploads/2016/10/bash-logo-web-300x126.png 300w" sizes="(max-width: 376px) 100vw, 376px" /></p> <p> <a href="https://madpsy.uk/useful-to-know-bash-parameters/#more-602" class="more-link">Read More <span class="meta-nav">»</span></a></p> </div> <footer class="entry-meta"> <span class="cat-links"> Filed Under: <a href="https://madpsy.uk/category/linux/" rel="category tag">Linux</a> </span> </footer> </article> <article id="post-590" class="post-590 post type-post status-publish format-standard hentry category-linux"> <header class="entry-header"> <h1 class="entry-title"><a href="https://madpsy.uk/prevent-apcupsd-shutting-down-the-os/" title="Permalink to Prevent apcupsd shutting down the OS" rel="bookmark">Prevent apcupsd shutting down the OS</a></h1> <div class="entry-meta"> Posted on <a href="https://madpsy.uk/prevent-apcupsd-shutting-down-the-os/" title="14:33" rel="bookmark"><time class="entry-date" datetime="2016-10-30T14:33:27+00:00" pubdate>October 30, 2016</time></a><span class="byline"> by <span class="author vcard"><a class="url fn n" href="https://madpsy.uk/author/nathan/" title="View all posts by MadPsy" rel="author">MadPsy</a></span></span> </div> </header> <div class="entry-content"> <p>If you have an APC UPS you may not, for whatever reason, want the OS to trigger a shutdown. The ‘apcupsd’ package will call shutdown whenever the battery capacity is reported too low. To prevent this, just edit the following file.</p> <p><img loading="lazy" decoding="async" class="alignnone size-full wp-image-633" src="https://madpsy.uk/wp-content/uploads/2016/10/8C516A38-5056-AE36-FE9E72B8749700C8_pr.jpg" alt="8c516a38-5056-ae36-fe9e72b8749700c8_pr" width="500" height="500" srcset="https://madpsy.uk/wp-content/uploads/2016/10/8C516A38-5056-AE36-FE9E72B8749700C8_pr.jpg 500w, https://madpsy.uk/wp-content/uploads/2016/10/8C516A38-5056-AE36-FE9E72B8749700C8_pr-150x150.jpg 150w, https://madpsy.uk/wp-content/uploads/2016/10/8C516A38-5056-AE36-FE9E72B8749700C8_pr-300x300.jpg 300w" sizes="(max-width: 500px) 100vw, 500px" /></p> <p> <a href="https://madpsy.uk/prevent-apcupsd-shutting-down-the-os/#more-590" class="more-link">Read More <span class="meta-nav">»</span></a></p> </div> <footer class="entry-meta"> <span class="cat-links"> Filed Under: <a href="https://madpsy.uk/category/linux/" rel="category tag">Linux</a> </span> <span class="sep"> | </span> <span class="comments-link"><a href="https://madpsy.uk/prevent-apcupsd-shutting-down-the-os/#comments">2 Comments</a></span> </footer> </article> <article id="post-621" class="post-621 post type-post status-publish format-aside hentry category-linux post_format-post-format-aside"> <header class="entry-header"> <h1 class="entry-title"><a href="https://madpsy.uk/how-to-download-iplayer-content-on-linux/" title="Permalink to How to download iplayer content on Linux" rel="bookmark">How to download iplayer content on Linux</a></h1> </header> <div class="entry-content"> <p>Here is a very simple way to download iPlayer content using a Linux command line tool. This literally downloads the stream and saves it to a file. The best part is, because they’re not DRM protected, you can keep it forever.</p> <p><img loading="lazy" decoding="async" class="alignnone size-full wp-image-631" src="https://madpsy.uk/wp-content/uploads/2016/10/bbc-iplayer-logo.jpeg" alt="bbc-iplayer-logo" width="400" height="340" srcset="https://madpsy.uk/wp-content/uploads/2016/10/bbc-iplayer-logo.jpeg 400w, https://madpsy.uk/wp-content/uploads/2016/10/bbc-iplayer-logo-300x255.jpeg 300w" sizes="(max-width: 400px) 100vw, 400px" /></p> <p> <a href="https://madpsy.uk/how-to-download-iplayer-content-on-linux/#more-621" class="more-link">Continue reading <span class="meta-nav">→</span></a></p> </div> <footer class="entry-meta"> <a href="https://madpsy.uk/how-to-download-iplayer-content-on-linux/" title="Permalink to How to download iplayer content on Linux" rel="bookmark">October 30, 2016</a> <span class="sep"> | </span> <span class="comments-link"><a href="https://madpsy.uk/how-to-download-iplayer-content-on-linux/#comments">1 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