Implementation of multiple pipes in C

I believe the issue here is that your waiting and closing inside the same loop that’s creating children. On the first iteration, the child will exec (which will destroy the child program, overwriting it with your first command) and then the parent closes all of its file descriptors and waits for the child to finish … Read more

node.js: cannot find module ‘request’

Go to directory of your project Make this directory a root of your project (this will create a default package.json file) Install required npm module and save it as a project dependency (it will appear in package.json) Create a test.js file in project directory with code from package example Your project directory should look like this Now just run node … Read more

Telnet [Unable to connect to remote host: Connection refused]

0.Configure Guest OS via Virtualbox as follows. 1.Install telnet use this command in main OS terminal: 2.Edit /etc/inetd.conf in main OS using your favourite file editor with root permission,add this line: 3.Edit /etc/xinetd.conf in main OS,make its content look like following: 4.Use this command to start telnet server in main OS: That was all. By … Read more

How to grep and replace

I need to recursively search for a specified string within all files and subdirectories within a directory and replace this string with another string. I know that the command to find it might look like this: But how can I replace every instance of string_to_find with another string?

How to get the process ID to kill a nohup process?

When using nohup and you put the task in the background, the background operator (&) will give you the PID at the command prompt. If your plan is to manually manage the process, you can save that PID and use it later to kill the process if needed, via kill PID or kill -9 PID (if you need to force kill). … Read more

Read and write to binary files in C?

Does anyone have an example of code that can write to a binary file. And also code that can read a binary file and output to screen. Looking at examples I can write to a file ok But when I try to read from a file it is not outputting correctly.

Yum fails with – There are no enabled repos.

ok, so my problem was that I tried to install the package with yum which is the primary tool for getting, installing, deleting, querying, and managing Red Hat Enterprise Linux RPM software packages from official Red Hat software repositories, as well as other third-party repositories. But I’m using ubuntu and The usual way to install … Read more

Hata!: SQLSTATE[HY000] [1045] Access denied for user 'divattrend_liink'@'localhost' (using password: YES)