process | 易学教程

capture error from runtime process java

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问题 I'm running a Java program from another Java application using Runtime.getRuntime().exec like this Process p1 = Runtime.getRuntime().exec("javac test.java"); Process p2 = Runtime.getRuntime().exec("java test"); The content of the test.java import java.io.*; class test { public static void main(String args[]) { Scanner sc = new Scanner(System.in); String s = sc.nextLine(); System.out.println(s); } } I want to handle Input , Output and Error stream of the process p2 . I did capture of the

How to update ENV variables in a Process without restarting it (NodeJS)?

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问题 I have a server running on NodeJS. Is there a way to update the environment variables in the process without restarting the server? What I'm looking to do is: Start my server npm start type something into the console to update ENV variable Server restarts with new environment variable 回答1: If you make a change to env variables they will take place immediately only if you make the change via the main Properties dialog for the system which is going to my computer -> Advanced properties ->

How to update ENV variables in a Process without restarting it (NodeJS)?

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Run commandline from c# with parameters?

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问题 It's possible to run commandline in c# by using something like this : process = new Process(); process.StartInfo.FileName = command; process.Start(); The problem is if the command string contains parameters, for example: C:\My Dir\MyFile.exe MyParam1 MyParam2 This will not work and I don't see how to extract the parameters from this string and set it on the process.Arguments property? The path and filename could be something else, the file does not have to end with exe . How can I solve this?

C# 打开指定文件或网址

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System.Diagnostics.Process.Start的妙用：文件夹打开时自动选中一个文件，比如自动选中此目录下的指定文件方法： Process.Start("Explorer", "/select," + filePath); 我们经常会遇到在Winform或是WPF中点击链接或按钮打开某个指定的网址, 或者是需要打开电脑中某个指定的硬盘分区及文件夹, 甚至是"控制面板"相关的东西, 那么如何做呢? 答案是使用System.Diagnostics.Process.Start()。它的作用是调用外部的命令。先来看看它的调用方法： Process.Start () Process.Start (ProcessStartInfo) Process.Start (String) Process.Start (String, String) Process.Start (String, String, SecureString, String) Process.Start (String, String, String, SecureString, String) 用浏览器打开指定网址比如： System.Diagnostics.Process ie = new System.Diagnostics.Process(); ie.StartInfo.FileName =

Python—同步和互斥

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from multiprocessing import Event,Process from time import sleep def wait_event(): print("process1也想操作临界区，但是要阻塞等待主进程") e.wait() print("主进程操作完了，到我了",e.is_set())#True def wait_event_timeout(): print("process2也想操作临界区，但是要阻塞等待主进程") e.wait(2) # e.wait() print("我不等了",e.is_set())#false e = Event() p1 = Process(name = "block",target = wait_event) p2 = Process(name = "non-block",target = wait_event_timeout) p1.start() p2.start() print("假设正在忙碌的操作临界资源") sleep(3) e.set() print("主进程操作完了，开放临界区") p1.join() p2.join() 　　来源： https://www.cnblogs.com/liuhaidon/p/12432909.html

Daemon threads vs daemon processes

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问题 Based on the Python documentation, daemon threads are threads that die once the main thread dies. This seems to be the complete opposite behavior of daemon processes which involve creating a child process and terminating the parent process in order to have init take over the child process (aka killing the parent process does NOT kill the child process). So why do daemon threads die when the parent dies, is this a misnomer? I would think that "daemon" threads would keep running after the main

Daemon threads vs daemon processes

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解决报错 ora-00704 ora-00604 ora-00942 启动不了数据库问题

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早上海南的同事打电话说他们的审计库连不上了启动也报错，问了下最近做了些什么操作，答复是之前添加了一次磁盘。猜测是添加磁盘启动后/dev/sdx顺序出错，或者没有正常的关闭数据库导致数据库无法正常启动。远程登过去，先看了一下alert日志：发现有如下报警： ORA-00704: bootstrap process failure ORA-00604: error occurred at recursive SQL level 1 ORA-00942: table or view does not exist Error 704 happened during db open, shutting down database USER (ospid: 6460): terminating the instance due to error 704 Instance terminated by USER, pid = 6460 ORA-1092 signalled during: ALTER DATABASE OPEN... opiodr aborting process unknown ospid (6460) as a result of ORA-1092 Tue Feb 23 10:59:31 2016 ORA-1092 : opitsk aborting process

Getting The Full Result from “ps”

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问题 How do I get the full width result for the *nix command " ps "? I know we can specify something like --cols 1000 but is there anyway I can the columns and just print out everything? 回答1: Try ps -w -w aux . The -w option sets the output to wide, and doing it twice makes the width unlimited. The "aux" part makes it show more information, and is (afaik) pretty standard mode to use. This is of course platform-dependant, the above works with procps version 3.2.7 on Linux. 回答2: Specify the w option