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What is Process?

A running instance of a program, with its own memory space, process ID, and system resources.

Every running program creates at least one process. Each process has a unique PID (Process ID), its own memory space, environment variables, and file descriptors. Processes can spawn child processes using fork().

Tools like ps, top, and htop display running processes. Signals like SIGTERM (graceful stop) and SIGKILL (force stop) control process behavior.

Related Terms

Systemctl
The primary command for managing systemd services, including starting, stopping, enabling, and checking service status.
SSH (Secure Shell)
A cryptographic network protocol for secure remote login and command execution over an unsecured network.
LVM (Logical Volume Manager)
A storage management framework that provides flexible disk management through abstract layers of physical and logical volumes.
Pipe
A mechanism that connects the output of one command directly to the input of another, enabling command chaining.
Journalctl
A command-line tool for querying and viewing logs collected by systemd's journal logging system.
SELinux
Security-Enhanced Linux — a mandatory access control system that confines programs to minimum required privileges beyond standard file permissions.
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