A default gateway is a network device that forwards traffic from a Linux system to destinations outside the local network. In most home and small office networks, the default gateway...

Swap memory is a disk-based storage area that Linux can use when physical RAM is not sufficient for running processes. Before troubleshooting memory-related issues, it can be useful to verify...

Determining whether an Ubuntu system needs to be rebooted can be helpful after installing system updates or upgrading important packages. Ubuntu provides a simple indicator that can be checked to...

A process ID (PID) is a unique number assigned by the Linux kernel to each running process. Shells such as Bash also run as processes, which means every active shell...

The cksum command calculates a checksum for a file, which helps detect accidental changes to its contents. For example, a checksum can be used to check whether a file was...

The rumdl is a fast Markdown linter and formatter written in Rust. It checks Markdown files for common style and formatting problems, reports violations with detailed diagnostics, and can automatically...

Linux control groups, commonly known as cgroups, provide mechanisms for controlling and monitoring resources allocated to processes and containers. Docker relies on cgroups to apply limits and manage resources such...

Identifying whether a process is running inside a Docker container is a useful diagnostic step when working with containerized applications. Container environments isolate processes from the underlying host, which can...

The terminal window has a defined number of rows and columns, and knowing these dimensions can be useful when working with shell scripts, command-line tools, and terminal-based interfaces. This tutorial...

In system programming, applications sometimes need to determine the directory from which the current process is operating. The current working directory can be useful when handling relative file paths, locating...