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linux

How-to articles, tricks, and solutions about LINUX

"No X11 DISPLAY variable" - what does it mean?

"No X11 DISPLAY variable" is an error message that you might see when trying to run a Java program that uses the X Window System to display a graphical user interface (GUI).

java linux variables x11 headless

Compiling php with curl, where is curl installed?

The location of the curl installation depends on the operating system and the method used to install it.

php linux curl installation compilation

Composer: file_put_contents(./composer.json): failed to open stream: Permission denied

This error message is indicating that the script is trying to write to the file "composer.json" in the current directory (indicated by "./"), but it doesn't have the necessary permissions to do so.

php linux laravel composer-php sudo

Downloading Java JDK on Linux via wget is shown license page instead

If you are trying to download the Java Development Kit (JDK) on Linux using wget and you are being shown the license page instead of the JDK download, it is likely because the download page has changed since the wget command was written.

java linux installation wget

How to activate virtualenv in Linux?

To activate a virtual environment in Linux, you can use the source command and the path to the activate script that is located in the virtual environment's bin directory.

linux python python-3.x virtualenv python-venv

How to check the presence of php and apache on ubuntu server through ssh

To check if PHP is installed on your Ubuntu system, you can use the following command:

php linux apache ubuntu ssh

How to Clean Your Ubuntu Machine

4 ways to clean your ubuntu machine. Here are some ways to clean your ubuntu PC and make it faster. Try the examples yourself and see the results.

linux file ubuntu

How to Copy a File from/to a Remote Server

SCP is being used to copy files from one machine to an other one. It can be used to transfer (download and upload) files vis ssh.

linux file

How to Count the Pages in a PDF File with PHP

PHP provides a range of extensions and functions for getting the number of pages in a PDF document. Let’s check out the most efficient ones, here.

php linux function pdf windows

How to Find All Files Containing Specific Text on Linux

Learn How to Find All Files Containing Specific Text on Linux with W3docs tutorial. Also, try the examples yourself and see the results.

linux text content file

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