environment-variables

问题 I install ubuntu 14.04 LTS (64bit) After that Install Eclipse Luno Standard for 64bit Install Jdk and follow all the step for setting jdk using following link, http://www.wikihow.com/Install-Oracle-Java-JDK-on-Ubuntu-Linux Then After I enable to start my eclipse it giving me a following Error, VM terminated. Exit code=2 /usr/bin/java -Dosgi.requiredJavaVersion=1.6 -XX:MaxPermSize=256m -Xms256m -Xmx1024m -jar /home/eheuristic/Ecclipse/eclipse//plugins/org.eclipse.equinox.launcher_1.3.0

问题 I read that "Strings longer than ${NSIS_MAX_STRLEN} (1024) will get truncated/corrupted." How can I safely update %PATH% environment variable ? 回答1: You can use an alternative NSIS build from the special builds page like the large strings build that defines NSIS_MAX_STRLEN=8192 and should prevent you from breaking the host path. In practice, on a desktop machine, 1024 byte seems enough, but on a development host with many tools installed (like mine), the path might be broken after

问题 How can I get the value of a custom environment variable in a classic ASP page using VBScript? 回答1: You can use the ExpandEnvironmentStrings method of the WScript.Shell object to retrieve environment variables. The following code will assign the value of the PATH environment variable to var myPath: set foo = createobject("WScript.Shell") myPath = foo.ExpandEnvironmentStrings("%PATH%") More info on the Shell object as MSDN Edit: Had to change the variable to which the shell object is assigned.

问题 I'm trying to find a file inside the system directory. The problem is that when using Environment.SystemDirectory On a x64 machine, i'm still getting the System32 directory, instead of the Systemwow64 directory. I need to get the "System32" directory on x86 machines, and "SystemWow64" directory on x64 Any ideas? EDIT: To find the SysWow64 i'm using the "GetSystemWow64Directory". (more information here: pinvoke Notice that on non-x64 machines - result is '0'. Hope this helps someone 回答1: Use

问题 How can I read a user specific environment variable? I know how to get a system wide one, like Environment.GetEnvironmentVariable("SOMETHING"); Thanks in advance! 回答1: Use the other overload of the Environment.GetEnvironmentVariable Method that lets you specify the EnvironmentVariableTarget. Environment.GetEnvironmentVariable(variable, target); target can be: EnvironmentVariableTarget.Process , EnvironmentVariableTarget.User , EnvironmentVariableTarget.Machine . 回答2: It's the same method,

问题 In the subprocess Python 2 module, Popen can be given an env . Seems that the equivalent way to do it with Process in multiprocessing module is to pass the env dictionnary in args or kwargs , and then use os.environ['FOO'] = value in the target . Is it the right way? Is it safe? I mean, no risk that the environment in the parent process or other child processes can be modified? Here is an example (that works). import multiprocessing import time import os def target(someid): os.environ['FOO']

问题 We have a custom C++ daemon application that forks once. So we've been doing this in our Upstart script on Ubuntu 12.04 and it works perfectly: expect fork exec /path/to/the/app However now we need to pass in an argument to our app which contains the number of CPUs on the machine on which it runs: cat /proc/cpuinfo | grep processor | wc -l Our first attempt was this: expect fork exec /path/to/the/app -t `cat /proc/cpuinfo | grep processor | wc -l` While that starts our app with the correct -t

问题 I have a web application that utilizes environment variables for some of its configuration (DB credentials, API keys, etc). I'm currently using Elastic Beanstalk for deployment and can easily set these from within AWS, which is great because I don't have this sensitive data in my code base. However, I'm looking into switching from Elastic Beanstalk so I can leverage a bit more flexibility with my web instances, and naturally I'm looking into deploying (from my Codeship CI setup) using

问题 I wonder which of the following is a preferred approach? We can set things up as APP_HOME=/path/to/file ( export in .profile or something along those lines) and access it as System.getenv("APP_HOME") Or, alternatively using properties as -DAPP_HOME=/path/to/file and access it as System.getProperty("APP_HOME") Now .. either one will make the value available for the application stand point, but is either approach preferred? Why? When? 回答1: If you are using Java 1.3 or 1.4 (and 1.2, IIRC), you

问题 When Vim is started, it grabs many of the environment variables from the operating system (like PATH ) and it also sets it own environment variables (like MYVIMRC ). How do I list or view all the environment variables that Vim understands and their respective values from inside Vim? 回答1: In Vim script, there is no designed way of getting the list of currently defined environment variables. However, it is possible to exploit Vim command-line completion feature. Consider possible completions