CompTIA Linux+ (XK0-006) glossary
Terms selected for CompTIA Linux+ (XK0-006) based on common objective language and practice focus.
Virtual Machine
Software-defined computer running as an isolated guest system.
Read full term ->Virtualization
Abstraction technology that runs multiple isolated environments on shared hardware.
Read full term ->Linux Shell
Command interpreter used to run Linux commands and scripts.
Read full term ->Bash
Common Linux shell used for command execution and scripting.
Read full term ->Container Image
Packaged filesystem and runtime instructions used to create containers.
Read full term ->Containerization
Application packaging method that bundles code and dependencies into isolated runtime units.
Read full term ->Docker
Popular platform and tooling ecosystem for building and running containers.
Read full term ->Infrastructure as Code (IaC)
Managing and provisioning infrastructure through declarative or scripted definitions.
Read full term ->Kubernetes
Container orchestration platform for deploying, scaling, and managing containerized workloads.
Read full term ->Ansible
Automation platform used for configuration management and orchestration.
Read full term ->Octal
Base-8 number system using digits 0 through 7.
Read full term ->SSH
Secure Shell protocol for encrypted remote command-line access.
Read full term ->SFTP
Secure file transfer protocol running over SSH.
Read full term ->chmod
Linux command used to modify file and directory permissions.
Read full term ->chown
Linux command used to change file or directory ownership.
Read full term ->cron
Time-based job scheduler for running commands at defined intervals.
Read full term ->crontab
Per-user table defining scheduled cron tasks.
Read full term ->TTY Console
Virtual text consoles available on Linux systems outside graphical sessions.
Read full term ->Daemon
Background service process that provides system or application functionality.
Read full term ->df
Command that reports filesystem disk space usage.
Read full term ->dig
DNS lookup tool for querying records and troubleshooting name resolution.
Read full term ->dnf
Package manager used on modern RPM-based Linux distributions.
Read full term ->du
Command that estimates file and directory disk usage.
Read full term ->/etc/fstab
Configuration file defining persistent filesystem mount behavior.
Read full term ->firewalld
Dynamic firewall management service commonly used on RHEL-family systems.
Read full term ->grep
Text-search command for matching patterns in files and command output.
Read full term ->groupadd
Command used to create new local groups on Linux.
Read full term ->Hard Link
Directory entry pointing directly to an inode on the same filesystem.
Read full term ->Inode
Filesystem metadata structure describing file attributes and block locations.
Read full term ->iptables
Legacy Linux packet filtering framework for firewall rule management.
Read full term ->journalctl
Command for querying and viewing systemd journal logs.
Read full term ->Kernel Module
Loadable component extending Linux kernel capabilities without rebooting.
Read full term ->LVM
Logical Volume Manager abstraction layer for flexible disk and volume management.
Read full term ->modprobe
Utility that loads or removes kernel modules with dependency handling.
Read full term ->mount
Command that attaches filesystems to the Linux directory tree.
Read full term ->nftables
Modern Linux packet filtering framework replacing iptables in many distributions.
Read full term ->nice
Command that launches processes with adjusted CPU scheduling priority.
Read full term ->renice
Command used to change scheduling priority of running processes.
Read full term ->PAM
Pluggable Authentication Modules framework for Linux authentication policy.
Read full term ->/etc/passwd
System file containing user account metadata and login shell information.
Read full term ->/etc/shadow
Protected system file containing password hashes and aging policy data.
Read full term ->Octal Permissions
Numeric Linux permission representation for owner, group, and others.
Read full term ->PID
Process identifier assigned by the OS to each running process.
Read full term ->Python Virtual Environment
Isolated Python dependency environment for application-specific packages.
Read full term ->mdadm
Linux utility for creating and managing software RAID arrays.
Read full term ->rsync
Efficient file synchronization tool transferring only changed data blocks.
Read full term ->SELinux
Mandatory access control framework enforcing security policy labels on Linux.
Read full term ->setuid
Permission bit allowing executable files to run with owner privileges.
Read full term ->setgid
Permission bit affecting executable group privilege or directory group inheritance.
Read full term ->Sticky Bit
Directory permission control restricting file deletion to owners and privileged users.
Read full term ->systemctl
Primary command-line utility for managing systemd services and targets.
Read full term ->tar
Archive utility for packaging files, often combined with compression tools.
Read full term ->top
Interactive process monitor showing CPU, memory, and runtime stats.
Read full term ->traceroute (Linux)
Linux utility that traces packet path toward a remote host.
Read full term ->umask
Default permission mask applied to newly created files and directories.
Read full term ->useradd
Command for creating new local user accounts on Linux.
Read full term ->yum
Package manager used on older RPM-based Linux systems.
Read full term ->apt
Package manager command interface for Debian-based Linux distributions.
Read full term ->zypper
Package management command-line tool used in SUSE-based distributions.
Read full term ->