In this C program #include <stdio.h> #include <stdlib.h> #include <unistd.h> #include <fcntl.h> int main() { int file = open("Result", O_CREAT|O_WRONLY, S_IRWXU)...

I am writing some tests using Test::More, and one of the functions I'm testing prints to STDERR. I'd like to test the output to STDERR, but am a little unsure how to do this. I know I'm close. This...

I am trying to redirect STDOUT AND STDERR to a socket. I did: if(fork() == 0) { dup2(newsock, STDOUT_FILENO); dup2(newsock, STDERR_FILENO); execvp(); } Somehow, it only showed the first litt...

I want to execute a program in a python application, it will run in the background but eventually come to the foreground. A GUI is used to interact with it. But controls are offered via a console...

I am stuck in this error for quite sometime now and have hit a dead end. I get this totally unhelpful error can't dup NilClass This is the situation. I have one class which is in a relationsh...

The Ruby docs for dup say: In general, clone and dup may have different semantics in descendent classes. While clone is used to duplicate an object, including its internal state, dup typically u...

I know that dup, dup2, dup3 "create a copy of the file descriptor oldfd"(from man pages). However I can't digest it. As I know file descriptors are just numbers to keep track of file locations and...

I know what dup / dup2 does, but I have no idea when it would be used. Any practical examples?

I'm working on a linux C project and I'm having trouble working with file descriptors. I have an orphan file descriptor (the file was open()'d then unlink()'d but the fd is still good) that has wr...

I have a hash like: h = {'name' => 'sayuj', 'age' => 22, 'project' => {'project_name' => 'abc', 'duration' => 'prq'}} I need a dup of this hash, the change should not affect...

arr = ["red","green","yellow"] arr2 = arr.clone arr2[0].replace("blue") puts arr.inspect puts arr2.inspect produces: ["blue", "green", "yellow"] ["blue", "green", "yellow"] Is there anyway t...

I have an object of a class, and I want to duplicate it with dup. One of the instance variables is an array, and it seems to be referencing it. I thought dup actually created a DUPLICATE. Here's m...

Can I get a really dumbed down explanation of the dup() function when it comes for duplicating file descriptors? I want to use pipe, but I have to also make the child to read from pipe(this is the ...

What's the difference between Ruby's dup and clone methods? describes the difference in the behavior of dup and clone. But when should I use dup, and when should I use clone instead? Examp...

Currently I'm coding a small shell (redirection, pipes, exec, etc.). Been trying to figure out the steps the Linux shell takes in addressing I/O redirection. Some questions on what I need help on:...

I have an assignment I'm working on and I'm having difficulty finishing it. The idea is to write a program if.c that executes one program and if that succeeds it executes the second program. I'm su...

I have a Pointer class with a single attribute :contents, that points to an object of class MyObject. class MyObject def hello; "hello" end end class Pointer attr_reader :contents def initiali...

I am trying to set up arbitrary pipelines from Perl, in much the same way as a shell might. This has the desired effect, it's like "echo foo | sed s/oo/ar/": #!/usr/bin/perl use strict; use IO::...

This is a follow up question from here. Where I want do go I would like to be able to temporarily redirect the stdout into a temp file, while python still is able to print to stdout. This would in...

This is a follow up question from here specifically concerning its answer. From a python module I am calling a Hello World executable that simply prints Hello World to the stdout. I am intereste...