I believe you’ll find interesting this blog post: Tags: Database schemas The Problem: You want to have a database schema where you can tag a bookmark (or a blog post or whatever) with as many tags as you want. Later then, you want to run queries to constrain the bookmarks to a union or intersection … Read more
You want the “popen” function. Here’s an example of running the command “ls /etc” and outputing to the console. #include <stdio.h> #include <stdlib.h> int main( int argc, char *argv[] ) { FILE *fp; char path[1035]; /* Open the command for reading. */ fp = popen(“/bin/ls /etc/”, “r”); if (fp == NULL) { printf(“Failed to run … Read more
If you check out the subprocess section of the Python docs, you’ll notice there is an example of how to replace os.system() with subprocess.Popen(): sts = os.system(“mycmd” + ” myarg”) …does the same thing as… sts = Popen(“mycmd” + ” myarg”, shell=True).wait() The “improved” code looks more complicated, but it’s better because once you know … Read more
Correction: On the emulator and most devices System.out.println gets redirected to LogCat and printed using Log.i(). This may not be true on very old or custom Android versions. Original: There is no console to send the messages to so the System.out.println messages get lost. In the same way this happens when you run a “traditional” … Read more
It’s running every minute of the hour 22 I guess. Try the following to run it every first minute of the hour 22: 0 22 * * * ….
You can get some limited memory information from the Runtime class. It really isn’t exactly what you are looking for, but I thought I would provide it for the sake of completeness. Here is a small example. Edit: You can also get disk usage information from the java.io.File class. The disk space usage stuff requires … Read more
First read: Concurrency vs Parallelism – What is the difference? Concurrency is the separation of tasks to provide interleaved execution. Parallelism is the simultaneous execution of multiple pieces of work in order to increase speed. —https://github.com/servo/servo/wiki/Design Short answer: With threads, the operating system switches running threads preemptively according to its scheduler, which is an algorithm … Read more
System properties are set on the Java command line using the -Dpropertyname=value syntax. They can also be added at runtime using System.setProperty(String key, String value) or via the various System.getProperties().load() methods. To get a specific system property you can use System.getProperty(String key) or System.getProperty(String key, String def). Environment variables are set in the OS, e.g. … Read more
I’d like to expand & clarify chaos’s answer a bit. If you surround your command with backticks, then you don’t need to (explicitly) call system() at all. The backticks execute the command and return the output as a string. You can then assign the value to a variable like so: output = `ls` p output … Read more
The psutil library gives you information about CPU, RAM, etc., on a variety of platforms: psutil is a module providing an interface for retrieving information on running processes and system utilization (CPU, memory) in a portable way by using Python, implementing many functionalities offered by tools like ps, top and Windows task manager. It currently … Read more