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…
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…
This post summarizes new features, bugfixes and changes in Linux kernel release 4.19.70. Linux 4.19.70 Release contains 95 changes, patches or new features. In total, there are 101,521 lines of Linux source code changed/added in Linux 4.19.70 release compared to Linux 4.19 release. To view the source code of Linux 4.19.70 kernel release online, please…
How to send a POST request in Go? For example, send a POST of content like ‘id=8’ to a URL like https://example.com/api. In Go, the http package provides many common functions for GET/POST. Related to POST requests, the package provides 2 APIs: Post Post issues a POST to the specified URL. func (c *Client) Post(url,…
How to convert a byte[] to io.Reader in Go directly? You can use the NewReader() func from the bytes package of Go to convert bytes to io.Reader. For example, reader := bytes.NewReader(thebytes)
In Go, how to create a Reader from a string? Many APIs use a Reader as its input. In Go, the strings.NewReader(s) library function creates a Reader from a string. Check the doc at: https://golang.org/pkg/strings/#NewReader
How to install Adobe Reader on Linux Mint 17? First, add Canonical PPA repository sudo add-apt-repository “deb http://archive.canonical.com/ precise partner” Then, update apt cache and install Adobe Reader sudo aptitude update sudo aptitude install acroread You can select “Yes” to set Adobe Reader as the default PDF viewer or “No” to not set it. E.Z.M.,…
What are good PDF annotation tools on Linux? Preferring saving the annotation in the PDF instead of separate files or images. I find the best solution may be wine + Foxit Reader. Foxit Reader can annotate PDF files and save them. It works very well on wine. Steps to install them: Install wine # yum…
Technology Hibernate Envers is the frameworks for auditing entities. As the name suggests Hibernate Envers is developed on top of Hibernate, it will on Hibernate and Hibernate implemented JPA. Hibernate Envers provides easy auditing, versioning solution for entity classes. Advantages of Hibernate Envers: Auditing of all mappings defined by JPA specification. Auditing Hibernate specific mappings…
With Google algorithm becoming more intelligent with each passing day, the margin for errors has significantly reduced over the past decade. Back in the day, you might get away with keyword stuffing but today, the same offense will strike off your website from Google search engine results. No one wants that, right. To save you…
Thunderbird automatically wraps lines by 72 characters by default. But wrapping in 72 characters may not look well on all clients. We may want Thunderbird not to wrap lines and let the receiver’s email client to choose the length to wrap lines. This post introduces how to make Thunderbird not wrap lines automatically. First, open…
In this post, how to unified Linux login and home directory using OpenLDAP and NFS/automount will be introduced. 0. System environment This solution is tested on Fedora 12 systems and CentOS 5. LDAP and NFS server: IP: 10.0.0.2 OS: Fedora 12 x86_64 ldap base dn: “dc=lgcpu1″ Clients: IP: 10.0.0.1/24 OS: Fedora 12 x86_64 1. LDAP…
Print PDF with notes is not that straightforward, especially when you want specific styles of the printed notes/comments. In this post, we introduce how to print notes on a PDF file with Acrobat, Adobe Reader and Foxit Reader. Acrobat The detailed method is posted on Adobe’s blog: Printing Sticky Notes on a PDF. Excerpt of…
.htaccess is a powerful tool. Let’s look at how to using .htaccess to redirect WordPress feeds to feedburner. Let’s use my blog as the example. The WordPress’s feed url of my blog is https://www.systutorials.com/feed/. Now I want to redirect it to feedburner with url http://feeds.feedburner.com/systutorials . The idea is quite straightforward: For every request to…
By default, all of the content of the post is shown in index, category, tag, archive and search pages. This is duplicate contents which may cause search engine penalty. The better way is using excerpt in index, category, tag and arhieve pages. By doing this the duplication can be avoided and the blog is optimized….
I want to move the sub domain blog.pkill.info to systutorials.com permanently. I can manage all the pages I want to post using WordPress. Changing domain in a bad way is dangerous. Put a page the tell the reader that the site is moved to a new domain is very unfriendly to the user and also…
Fedora’s repositories provide most of the software packages needed when using Linux. However, for various consideration, they do not provide some packages, such as MPlayer, ffmpeg. Fortunately, some community maintained repository provides these software. And they may also package propriety software, such as ATI fglrx dive, NVIDIA driver, into rpm packages. In this post, we…
Compiling a latex documents may take several steps when bibtex is used with latex. However, this latex compilation process is the same for most documents. We can make it a template with Makefile so that simply running make will generate the dvi/ps/pdf files for us. A simple Makefile for using latex with bibtex enabled is…