Eclipse is one of the good IDEs for C/C++ projects with its great source code indexer. It is common the source code version is controlled by some tools like Git for software projects. It is convenient if the IDE can show the current changes compared to the committed code version. In this post, we will…
How to generate a pair of RSA private and public key in Go lang? Go lang has a rich set of standard libraries. Using Go’s standard libraries, we can generate RSA private and Public keys. The Crypto standard libraries in Go lang Go lang standard libraries has a rich set of cryptography functions. Here are…
Google Doc documents support comments which is useful for collaborative editing of files with comments to each others. But when we print the document from Google Doc, the comments are not included. How to print the document with comments in page margins? In this post, we will introduce a method using the opensource and free…
“Comments” and “tracking changes” are nice features of the opensource LibreOffice software (and other Office software) to add comments and track changes in documents. OpenDocument ODT and MS Word DOCX/DOC file formats all support comments and change trackings. When we print the documents, how to print the comments in the page margins too in LibreOffice?…
Git tracks changes as commits. This makes it possible and convenient to check the code change history in a repository. However, this also has side effect. The history consumes storage and the whole repository including the current version of the code files and all the previous changes may be quite large. This is especially a…
Git submodule is a nice and convenient mechanism in Git to include the other Git repositories and manage the version/commit used from the submodule Git repository. However, there are cases where we would like “reset” the submodule, such as when we find updating a submodule repository will break the code tree, or merge some updates…
We ever discussed How To Install R and RStudio Desktop in Ubuntu Linux 20.04. In this post, we introduce how to install R and RSTudio Desktop on macOS. Install R environment Install R environment as follows using Homebrew. $ brew install R Then verify that the R environment is installed and ready, by running in…
It is common to convert an integer (int) to a string (std::string) in C++ programs. Because of the long history of C++ which has several versions with extended libraries and supports almost all C standard library functions, there are many ways to convert an int to string in C++. This post introduces how to convert…
Having a reading list from RSS feeds is a convenient way to organize and aggregate various information source from the Web. After Google Reader was retired, many different readers services are available. Feedly and Follow.it are two good choices among those RSS feed readers. Different readers have different features. Follow.it provides features like keyword filtering…
We ever discussed How To Install R and RStudio Server in Ubuntu Linux 20.04. If the purpose is to install a local RStudio IDE instead of a remote RStudio Server, we can install RStudio Desktop. In this post, we introduce how to install R and RStudio Desktop on Ubuntu Linux 20.04. For other Ubuntu version,…
R is a language and environment for statistical computing and graphics, providing a wide variety of statistical and graphical techniques. The R environment is open source software under GPL. R has rich software packages and is widely used for statistical analysis. RStudio Server is an R integrated development environment (IDE) that provides many useful features…
This change “fs: handle SEEK_HOLE/SEEK_DATA properly in all fs’s that define their own llseek” (commit 06222e4) in Linux kernel is authored by Josef Bacik <josef [at] redhat.com> on Mon Jul 18 13:21:38 2011 -0400. Description of “fs: handle SEEK_HOLE/SEEK_DATA properly in all fs’s that define their own llseek” The change “fs: handle SEEK_HOLE/SEEK_DATA properly in…
Git’s tags are convenient use to name some specific commits by tagging them for releasing or book keeping purposes. For example, GitHub allows repository managers to make releases using git tags. However, it may happen by mistake that a git tag is pushed to the remote git server while the tag has been made to…
Counting the number of words in a file is useful in many programs. In this post, we will discuss how to count the number of words in a file in a PHP script. In PHP standard library, we have function str_word_count($str) which returns the number of words from a string $str. On the other hand,…
DNF/YUM can automatically download the RPM packages and install them. Under some situations, we may prefer to make a copy of the RPM files for offline usage so that no need to have network connections to install the software packages. For such purposes, we need to make a copy of the RPM packages. It is…
Python is one of the most popular programming languages in the world. It is widely popular for a plethora of tasks due to its flexible nature and ease of use. Python has also managed to beat other programming languages such as Java, which were once upon a time, the world’s favorite. In fact, the extent…
Each process has its environment variables in Linux. But is it possible to change another process’ environment variable from another process in Linux? If it is possible to do so, how to do it? There is a trick which can work for some scenarios. First, find out the process ID, then start gdb and attach…
Feedburner used to a powerful tool for RSS feeds publishing and subscriber management. However, feedburner will unlikely leave its maintenance mode because there has been no new features yet less features for quite some years. But RSS feed is still an important part of the Web supported by many software such as WordPress. follow.it is…
In Bash script, it is common that multiple small commands run together connected by pipes (|) and the whole command is quite long. For clarity, we may write the command in multiple lines. How to add comments for these long multi-line commands? In Bash, the content after # in a line is the comment. Using…
Perl one-liners with perl’s regular expression statement can be a very powerful text processing tools used as commands in a terminal or a script. By default, the input to the perl one-liner with -p or -n options is passed line by line. However, when we want to match multiple lines, it gets us some trouble….