How to get an environment variable in Go?
In Go lang, how to get an environment variable?
To get an environment variable (e.g. “VAR”) in GO:
import "os"
import "fmt"
fmt.Println("VAR:", os.Getenv("VAR"))
In Go lang, how to get an environment variable?
To get an environment variable (e.g. “VAR”) in GO:
import "os"
import "fmt"
fmt.Println("VAR:", os.Getenv("VAR"))
How to force yum not to update certain packages, such as kernel? I manually compiled a kernel module for a specific kernel version. As long as it works well, I do not want to update it. Another example is that I want a specific version of sbt. How to force yum exclude it from being…
Managing our research cluster, I frequently need to generate some string for new users’ password. How to generate them automatically and randomly in Scala? The passwords need characters ‘a’ – ‘z’, ‘A’ – ‘Z’ and ‘0’ – ‘9’ only. This piece of code works very well for me: def randomString(len: Int): String = { val…
Common DNS queries like ping will first get the IP of a hostname if it exists in /etc/hosts. How to find the hostname of an IP using /etc/hosts if it has the mapping on Linux? Multiple tools on Linux can do the “reverse” checking using /etc/hosts file. For example, if we have a line 192.0.2.1…
IE的代理设置用起来并不方便,我自己而言就要经常更改代理服务器,相信很多人有跟我相同的需要。使用C++编写了一个小程序SetProxy调用Win32 API来设置代理服务器IP,用起来方便多了。 编译后为一个可运行console程序,将它放在\windows\system32目录下,使用时只要运行 SetProxy IP:port 就可以把IP设置好,如果要关闭代理,只需运行 SetProxy “” 命令行中运行,界面较土,但用着方便。可以考虑设置几个快捷方式在桌面或者工具栏,点击即设置代理,其它方式发挥想象。 程序下载地址. 源代码也放在这里,希望有需要的人可以用得上 ;) 源代码下载地址. 这是一份有些年头的代码, 如果你在较新的编译器下编译这个项目, 请先做[[setproxy-一个设置ie代理的小工具#comment-995|这里所述的小修改]]. — Eric on Apr. 9, 2014. Read more: Making Emacs Start Up Faster Profiling Vim to Find Out Which Plugin Makes Vim Slow Handling Sparse Files on Linux Spring Shell Technology For Java development Vim Tutorial for Beginners: vimtutor…
In this post, creating a file-backed virtual block device (VBD) and installing Fedora 20 in the Xen DomU via internet will be introduced. This domain is created on a Fedora 20 Dom0 as introduced in https://www.systutorials.com/installing-xen-on-fedora-20-as-domain-0/. For better performance, you may consider using LVM backed VM. Create file-backed VBD The actual space of VBD will…
How to escape the XML CData section ending sequence ]]>? The ]]> sequence itself may be part of the content in a CData section. One solution is to split the ]]> token into 2 CData sections. <![CDATA[to split the ]]]]><![CDATA[> token ]]> Read more: Which are sequence points in C? How to escape special characters…