How to quite VirtualBox scale mode?

ByEric Ma Mar 24, 2018Mar 24, 2018

Use this hot key shortcut to quit VirtualBox scale mode

Right_Ctrl + c

QA

How to set options for scala in sbt
ByEric Ma Mar 24, 2018Mar 24, 2018

In sbt, I found this message printed out by the scala compiler: [warn] there were 1 deprecation warning(s); re-run with -deprecation for details [warn] one warning found The question is, how to add options (-deprecation here) to the scala compiler in sbt? You can use this inside the sbt console: set scalacOptions += “-deprecation” Read…

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QA

How to change the default text editor on Linux
ByEric Ma Mar 24, 2018Mar 24, 2018

On Linux, a default editor is used for text editing such as crontab -e or git commit. How to change it to the editor of my own choice? The default editor is indicated by the EDITOR environment variable. You can set this environment variable to set the default editor. For example, set it to emacs…

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Tutorial

5 necessary PC hardware that a programmer needs to upgrade
ByJames Clark May 30, 2019Nov 21, 2019

The world of technology has evolved drastically over the last few decades. Almost every aspect of our lives is dominated by technology. At the heart of technology lies computer programming. Computer programming is what dictates the success of the technology. I mean think about it, your smartphone, PC, ETC they all rely on programming. This…

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QA

How to test a file or directory exists in Python?
ByEric Ma Mar 24, 2018Mar 24, 2018

In Bash, the [ -f ] and [ -d ] tests can test whether a file or a directory exist. What are the corresponding python method for these tests? For -f: **os.path.isfile(path)** Return True if path is an existing regular file. This follows symbolic links. For -d: **os.path.isdir(path)** Return True if path is an existing…

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QA

How to upgrade vim to version 8 on CentOS 7?
ByEric Ma Mar 24, 2018Sep 6, 2020

vim on CentOS 7 is version 7.4 with patches 1-160: $ vim –version VIM – Vi IMproved 7.4 (2013 Aug 10, compiled Dec 21 2016 17:00:20) Included patches: 1-160 How to upgrade it to version 8 which is the latest major version? Update on Oct 23 2018: the repository introduced in the original method is…

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Programming

OCaml Learning Materials
ByEric Ma Jul 13, 2013Sep 17, 2020

OCaml is an interesting functional language. There are lots learning materials on the Internet. I compile a list of resources for OCaml learning and reference. Recommended OCaml learning and reference material Online book of Real World OCaml by Yaron Minsky, Anil Madhavapeddy, Jason Hickey. A very good tutorial by Jason Hickey: http://www.cs.caltech.edu/courses/cs134/cs134b/book.pdf. The OCaml system…

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