Category Archives: workday

SVG: Elliptical arc path

Scalable Vector Graphics allows elliptical paths. Here is rendered image, which can help to realize meaning of the parameters. In case below all elipses and circles are have end points [0,0] and [70.71, 70.71]. Second point is on the circle … Continue reading

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find a files with -maxdepth and -mindepth

Unix utility find allows many arguments. Here is how one can limit searched directories. Arguments -maxdepth and -mindepth should be used first before let’s say -name or -type. Let’s created four sub directories to investigate how it works: $ mkdir … Continue reading

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Eclipse weather

Weather for Solar eclipse on August 21, 2017 across USA determined how people could experience such rare event.

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Eclipse August 21, 2017

Eclipse on August 21, 2017 will be visible in Minnesota only as a partial eclipse. Total eclipse can be visible south of Minnesota, probably good place to go will be places in Nebraska, Kansas or Missouri. Totality will be around … Continue reading

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Sexagesimal one character digits

Sexagesimal (base 60) is a numeral system with sixty as its base. In some form with help of decimal digits ┬áis used for measuring time, angles, and geographic coordinates. There are no special symbols for it’s digits like in binary … Continue reading

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Romaine lettuce orange juice smoothie

Simple and easy romaine lettuce orange juice smoothie. See pictures below. There are about 225g of lettuce and 335g of orange juice resulting in two glasses of the smoothie. Good source of information about food is at http://www.ars.usda.gov/ba/bhnrc/ndl including downloadable … Continue reading

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md5sum for files in the directory

Here is nice one line solution to generate list of md5sums: ls *.py | while read f;do md5sum $f;done > /tmp/list1.md5sums Or oneliner for subdirectory tree: find . -name “*.py” | while read f;do md5sum $f;done

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Charter 6rd configuration

It’s good to know, that Internet Service Provider CHARTER is getting ready for IPv6. There is a trial program, and here is working Linux configuration: #edit /etc/config/network #/etc/init.d/network reload config interface ‘wan6’ option proto ‘6rd’ option peeraddr ‘68.114.165.1’ option ip6prefix … Continue reading

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Ethernet cables

With improving internet infrastructure, higher speeds are now possible. In case of gigabits per second speed one needs to pay attention to the ethernet cable. Better to choose Cat 5e or even Cat 6. There is nice article What Kind … Continue reading

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SSH port tunneling

Let’s say, a user1 has a ssh connection to the ssh.exampleserver.com, and he would like to view a webpage on intranet server 10.0.0.11 available from exampleserver. Then command could be like this: ssh -L 8000:10.0.0.11:80 user1@ssh.exampleserver.com If using Putty, one … Continue reading

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