Category Archives: Linux

curl showing its age with SSL error

Intro I’ve used curl as a debugging tool for a long time. But time moves on and my testing system didn’t. So now for the first time I saw an error that is produced by this situation, and I will … Continue reading

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Adding a swap file in Amazon AWS for CentOS

Intro I was running a new daemon on my server, factomd, to experiment with digital currency. It’s an old m1.small instance with only 1.7 GB of memory. The first few times I ran it it would 70000 or so blocks, … Continue reading

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Switch home router to DD-WRT: FAIL

Intro I am having problems with my home router, a Cisco E1200, especially with the wireless connections. I thought it might be interesting to try to run it using the open source routing code DD-WRT. Since I am a Linux … Continue reading

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Roll your own dynamic DNS update service

Intro I know my old Cisco router only has built-in support for two dynamic DNS services, dyndns.org and TZO.com. Nowadays you have to pay for those, if even they work (the web site domain names seem to have changed, but … Continue reading

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What I’m trying out now – Amazon Fire HD 8 Tablet

Intro I had previously praised an HP Touchpad Tablet, but that was another time and times have moved on. Now I’m trying the new Fire HD 8 Tablet and am quite impressed. It’s not perfect however. Here are some features … Continue reading

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Roll your own domain drop catching service using GoDaddy

Intro I’m after a particular domain and have been for years. But as a matter of pride I don’t want to overpay for it, so I don’t want to go through an auction. There are services that can help grab … Continue reading

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Solution to this week’s NPR puzzle using simple Linux commands

Intro Every now and then the weekend puzzle is particularly amenable to partial solution by use of simple Linux commands. I suspected such was the case for this week’s, and I was right. The challenge for this week Take a … Continue reading

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What I’m working on now: Raspberry Pi Touch Display

Intro I’ve been waiting for a decent, inexpensive display for the Raspberry Pi and now they make one. http://www.mcmelectronics.com/product/83-16872 I’m one of the lucky ones – I got one before it was put on backorder! Anyway it’s just $60 plus … Continue reading

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Narrowing down answer to NPR puzzle with Linux commands

Intro This is for CentOS and RedHat Linux. Narrow things down $ egrep ′^[a-z]{6}$′ /usr/share/dict/linux.words |sed ′s/.//′|s ort|uniq -c|sort -k1 -d -r > 6-ltr-last-5 Mind the line break in the display of this command – you have to join things … Continue reading

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Solution to NPR puzzle: capitals and cities

Problem statement Take a US state capital. Drop a letter. Re-arrange the remaining letters to get the name of a US city. There are two answers. I know Wlll Shortz says he makes up problems that are not programmable, but … Continue reading

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