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"ldd" - Dynamic Library Dependency Checker
This section provides a tutorial example on how to use the 'ldd' tool to list dynamic library dependencies of any executable files, including dynamic library files on Linux systems.
2022-10-01, 100🔥, 0💬

"make" - Manage Program Build Process
This section provides a tutorial example on how to use the 'make' tool to manage the build process of large programs that have multiple components.
2022-10-01, 100🔥, 0💬

Apache PHP file_put_contents() Permission Denied
This section provides a tutorial example on 'write' permissions in Apache HTML directory from PHP script file_put_contents() function call using the PHP-FPM module on CentOS systems.
2022-10-01, 100🔥, 0💬

SELinux Security Context on /var/www/html
This section provides a tutorial example on how to change the SELinux security context type on sub directories inside /var/www/html to allow new files to be created by PHP scripts running on the Apache Web server on CentOS systems.
2022-10-01, 100🔥, 0💬

Conda - Environment and Package Manager
This chapter provides introductions and tutorial examples about Conda environments. Topics include installing Conda from the Miniconda package; starting/ending Conda 'base' environment; installing Conda packages.
2022-10-01, 100🔥, 0💬

What Is Conda
This section provides a quick introduction on Conda, which is a powerful open source environment and packager manager that allows you to install multiple environments for multiple versions of software packages and their dependencies and switching easily between them.
2022-10-01, 100🔥, 0💬

Install Miniconda 3
This section provides a tutorial example on how to install Miniconda 3. Once installed, you can start and end the Conda 'base' environment similar to a Linux shell.
2022-10-01, 100🔥, 0💬

Introduction to Conda Environment
This section provides a quick introduction about the Conda environment, its file directories and command programs. Steps to verify its Python version, and install new packages.
2022-10-01, 100🔥, 0💬

Change PHP Configuration Settings
This section provides a tutorial example on how to change PHP configuration settings, like increasing upload_max_filesize and post_max_size to upload large files with PHP scripts.
2022-10-01, 100🔥, 0💬

Email Client Tools - Mail User Agents (MUA)
This chapter provides introductions and tutorial examples about Email Client Tools, also called Mail User Agents (MUA). Topics include installing and configuring Thunderbird; configuring macOS Mail; troubleshoting Windows 10 Mail.
2022-10-01, 100🔥, 0💬

Thunderbird Configuration for POP3S and SMTP
This section provides a tutorial example on how to configure Thunderbird to use POP3S (POP3 with SSL/TLS) with normal password for incoming emails and SMTP with no authentication for outgoing emails.
2022-10-01, 100🔥, 0💬

Thunderbird to Accept POP3S Certificate Exception
This section provides a tutorial example on how to handle POP3S server Certificate Exception on Thunderbird. Just click 'Confirm Security Exception' to accept and store the default certificate provided by Dovecot server.
2022-10-01, 100🔥, 0💬

macOS Mail Auto Configuration
This section provides a tutorial example on how to configure macOS Mail to automatically detect and select POP and SMTP services from the mail server.
2022-10-01, 100🔥, 0💬

macOS Mail Manual Configuration
This section provides a tutorial example on how to view and change macOS Mail connection settings manually, with different port number, SSL/TLS and authentication options.
2022-10-01, 100🔥, 0💬

Accept Certificate Exception in macOS Mail
This section provides a tutorial example on how to handle mail server certificate exceptions in macOS Mail.
2022-10-01, 100🔥, 0💬

Windows 10 Mail Configuration Failed
This section provides a tutorial example on how Windows 10 Mail failed to connect email services provided by Postfix and Dovecot servers.
2022-10-01, 100🔥, 0💬

SSL/TLS Connection Issue in Windows 10 Mail
This section provides a tutorial example on troubleshot the root cause of Windows 10 Mail connection issue. It could be the SSL protocol version or self-signed server certificate.
2022-10-01, 100🔥, 0💬

"mailx" Command - Send and Read Emails
This section provides a tutorial example on how to install and use 'mailx' on CentOS computers to read and send emails locally or remotely via IMAP/POP and SMTP protocols.
2022-10-01, 100🔥, 0💬

"Alpine" - Terminal-Based Email Client
This section provides a tutorial example on how to install and use 'mailx' on CentOS computers to read and send emails locally or remotely via IMAP/POP and SMTP protocols.
2022-10-01, 100🔥, 0💬

Tools and Utilities
This chapter provides introductions and tutorial on Linux tools and utilities. Topics include installing Tesseract OCR engine.
2022-10-01, 100🔥, 0💬

Install Tesseract as the OCR Engine
This section provides a tutorial example on how to install Tesseract as the OCR Engine.
2022-10-01, 100🔥, 0💬

Thunderbird Configuration for IMAPS and SMTP
This section provides a tutorial example on how to configure Thunderbird to use IMAPS (IMAP over SSL) with normal password for incoming emails and SMTP with no authentication for outgoing emails.
2022-10-01, 100🔥, 0💬

Graphics Environments on Linux
This chapter provides introductions and tutorial examples about graphics environments. Topics include introduction to GNOME desktop; creating GNOME applications in Python; introduction to XQuartz X11 server; running Tk Python, Matplotlib Python scripts and Java GUI apps on GNOME desktop and X11 serv...
2022-10-01, 100🔥, 0💬

"-XX:+PrintGCDetails" - Garbage Collection Logging
This section describes HotSpot JVM options to generate garbage collection logging messages. It also describes log message format to help us understand what the JVM is telling us.
2022-10-01, 100🔥, 0💬

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