CompTIA Linux+ XK0-005 Cram Study Set for 2024 Update., Exams of Linux skills

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CompTIA Linux+ XK0-005 Cram Study Set for 2024

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fstab (File System Table) - > A configuration table designed to ease the burden of mounting and unmounting file systems to a machine. vim - > A basic GUI based text editor that comes with distribution of Linux, BSD, and MacOS. nmcli (Network Manager Command Line Interface) - > A command-line tool used for controlling NetworkManager and reporting network status. du (Disk Usage) - > Unix/Linux command used to check disk usage of files and directories on a system. xfs (High Performance Scalable File System) - > A high-performing, 64 - bit journaling Linux file system originally created by Silicon Graphics. cp (Copy) - > A Unix/Linux command that allows for the copying of files from one location to another. rm (Remove) - > A Unix/Linux command that allows for the removal of files from one location to another. mkdir (Make Directory) - > A Unix/Linux command that creates or "makes" a directory within a File System. mv (Move) - > A Unix/Linux command that moves a selected file from one location to another. df (Disk Free) - > A Unix/Linux command that displays the amount of disk space available on the filesystem. exFAT (Extended File Allocation Table) - > A 64 - bit version of the file allocation table file system designed for use on large USB flash drives.

ext4 (Extended File System 4)1 - > A file system designed for Linux platforms as a successor to the previous version, that allows for standard functions such as formatting volumes, drives, and other computing storage solutions. SSH (Secure Shell) - > A cryptographic network protocol for operating network services securely over an unsecured network. Uses Port 22 TCP. enable - > A Linux process to have a process open upon system startup. start - > A Linux command to start a process upon it's demand. restart - > A Linux command to restart a process upon command. stop - > A Linux command to stop a process upon command. udevadm (Udev Management Tool) - > A device management tool in Linux which manages all the device events and controls the udevd daemon. systemctl (System Control Temporal Logic) - > Manages both system and service configuration, enabling administration to manage the OS and control the stats of services. systemd - > A software suite that provides an array of system components for Linux operating systems with the aim to unify service configuration and behavior across Linux Distributions. firewalld - > A firewall management tool for Linux to provide firewall features; acting as the front-end of the Linux kernel's netfilter framework. ps (Process Status) - > A Linux command that displays information related to running processes. iostat (Input/Output Statistics) - > A Linux monitor tool used to collect and show operating system storage input and output statistics. arp (Address Resolution Protocol) - > A Linux command that allows users to manipulate the neighbor cache or ARP table.

ls (List) - > Linux command that lists the files and sub-directories in the current directory. ping - > Sends a message from one computer to another to check whether it is reachable and active. timedatectl - > Linux command used to set and change system clock settings and enable or disable time synchronization services. ntp (Network Time Protocol) - > An internet protocol used to synchronize with computer clock time sources in a network. Runs off of Port 123 UDP. telnet - > A network protocol that allows a user on one computer to log into another computer that is part of the same network. Not secured at all. Runs off of Port 23 TCP. host - > A Linux command used to find a variety of information through Domain Name System (DNS). dpkg (Debian Package) - > A medium-level too to install, build, remove, and manage Debian Linux packages. rpm (Red Hat Package Manager) - > A package manager developed for Red Hat/Fedora distributions of Linux. zypp - > An open-source package manager engine for certain Linux applications, meant for openSUSE and SUSE Linux Enterprise. apt (Advanced Packaging Tool) - > A Ubuntu based packaging tool meant for installing new software packages, upgrading existing packages, updating package list indexes, and upgrading entire Ubuntu systems. .deb - > A file format for software packages, meant for Debian Linux Distributions and their derivatives. yum (Yellowdog Updater, Modified) - > The primary package management tool for installing, updating, removing, and managing software packages in Red Hat Enterprise Linux.

cron - > A method to automatically run commands on a schedule within Linux. /etc/yum.repos.d - > Linux Directory that contains um configuration files (.repo files), which contain the URL to servers to fetch packages from. /var/log/secure - > Linux Directory meant to keep authentication logs for both successful or failed logins, and authentication processes. modprobe (Module Probe) - > A Linux program used to add or a loadable kernel module to the Linux kernel. ioping (Input/Output Ping) - > A Linux command used to monitor I/O latency in real time, showing disk latency the same way as the ping command showing network latency. lsmod (List Modules) - > A Linux command used to display the status of modules in the Linux kernel. depmod (Dependency Modules) - > A Linux command used to generate a list of dependency descriptions of kernel modules and its associated map files. LDAP (Lightweight Directory Access Protocol) - > An open, vendor-neutral, industry standard application protocol for accessing and maintaining distributed directory information services over an Internet Protocol network. PAM (Pluggable Authentication Modules) - > A suite of libraries that allows a Linux system administrator to configure methods to authenticate users. Public Key (Asymmetric) Encryption - > A large numerical value that is used to encrypt data. Private Key (Symmetric) Encryption - > A cryptographic key that is used with an asymmetric cryptographic algorithm. PKI (Public Key Infrastructure) - > A combination of policies, procedures and technology needed to manage digital certificates in a public key cryptography scheme. /etc/skel - > A Linux directory that contains files and directories that are automatically copied over to new user's when it is created from the useradd command.

/etc/bashrc - > A Linux directory that contains system-wide functions and aliases including other configurations that apply to all system users. /var/logs - > A Linux directory meant for storing logs within the LinuxOS. /dev/sda# - > The directory for a specific drive within Linux. chown (Change Owner) - > A Unix/Linux command used to change the owner of file system files or directories. chgrp (Change Group) - > A Unix/Linux command used to change the group that a user is associated with. chage (Change Age) - > A Linux command used to change the number of days between password changes. chmod (Change Mode) - > A Unix/Linux command used to change access permissions of file system objects. useradd (User Add) - > A Linux command used to create a new user. usermod (User Modify) - > A Linux command used to modify an existing user. userdel (User Delete) - > A Linux command used to remove or delete a user. passwd (Password) - > A Linux command used to change the password on a user account. Self-Signed Certificate - > Public-Key Certificates that are not issued by a certificate authority. Sticky Bit - > A bit set on directories that allows only the owner or root to delete certain files and subdirectories. ssh-keygen (Secure Shell Key Generation) - > A Linux tool used for creating new authentication key pairs for SSH.

chroot jail (Change Root Jail) - > An artificial root directory used to limit the directory access of a potential attacker. SUID (Set-User Identification) - > A special file permission for executable files that enables other users to run the file with the same permissions as the file owner. SGID (Set Group Identification) - > A special file permission that enaables other users to inherit the effective group identifier of a group owner. /etc/sudoers - > A file that Unix/Linux administrators use to allocate system rights to system users. Port Forwarding - > The process of redirecting traffic from its normally assigned port to a different port, either on the client or server. nano - > A Linux text editor within a command-line interface. visudo (Vim Sudo) - > A text editor for specifically the sudoers file, conducting multiple sanity and error checks constantly. gedit (GNOME Edit) - > The default text editor for GNOME desktop environments in Linux. getfacl (Get File Access Control Lists) - > Linux Command that displays the filename, owner, group, an Access Control List. setfacl (Set File Access Control Lists) - > Linux command that sets the Access Control Lists of files and directories.

• Redirects a system output to the end of a file instead of the standard output. echo - > Linux command that repeats back what a user specifies (ex. Print Function). stdout (Standard Output) - > The default file descriptor where a process can write output.

PATH - > An environment variable that instructs a Linux system in which directories to search executables. docker - > An open software platform that allows you to build, test, and deploy applications quickly. docker info - > Docker command that displays system wide information regarding docker installations. docker ps (docker process status) - > Docker command that shows the status of docker containers. docker pull - > Docker command that downloads a Docker images from the internet. docker push - > Docker command that uploads Docker images to the internet. docker logs - > Docker command that fetches the logs of Docker containers. Container - > A standard unit of software that packages up code and all its dependencies so the application runs quickly and reliably from one computing environment to another. Container Image - > A static file with executable code that can create a container on a computing system. Container Engine - > Cluster management and container orchestration system developed to run and manage Docker containers. git - > A distributed version control system that tracks changes in any set of computer files. checkout - > Git command that tells which branch or commit you want your changes applied to. YAML - > Human-readable data serialization language commonly used for configuration files and some applications. merge (git) - > Git's way of putting a forked history back together again.

Samba - > The standard Windows interoperability suite of programs for Linux and Unix. Orchestration - > The automation of deployment, management, scaling, and networking of containers. Service Mesh - > A dedicated infrastructure layer that controls service-to-service communication over a network. Container Registry - > A repository or collection of repositories used to store and access container images. du / (Disk Usage /) - > Linux command that displays the number of blocks for each file or directory within a system. ls / (List /) - > Linux command that displays the names and features of files and directories. ulimit ( - > A Linux command that provides a way to get and set process resource limits. noop (No Operation) - > The simplest I/O schedule for the Linux kernel that inserts all incoming I/O requests into a simple FIFO (First-In/First-Out) queue and implements request merging. lvm (Logical Volume Management) - > Storage virtualization that offers system administrators a more flexible approach to managing disk storage space than traditional partitoning. lvcreate (Logical Volume Create) - > Linux command that creates a new logical volume in a volume group. lvchange (Logical Volume Change) - > Linux command that allows the user to change the attributes of a logical volume including making them known to the kernel ready for use. lvscan (Logical Volume Scan) - > Linux command that scans all known logical volume groups or all supported LVM block devices in the system.

pvcreate (Physical Volume Create) - > Linux command that initializes Physical Volumes for later use by the Logical Volume Manager. pvscan (Physical Volume Scan) - > Linux command that scans all supported LVM block devices in the system for physical volumes. pvchange (Physical Volume Change) - > Linux command that allows you to change the allocation permissions of one or more physical volumes. vgscan (Volume Group Scan) - > Linux command that scans all SCSI, IDE disks, multiple devices and a bunch of other disk devices, in order to look for LVM physical volumes and volume groups. vgchange (Volume Group Change) - > Linux command that allows you to change the attributes of one or more volume groups. vgcreate (Volume Group Create) - > Linux command that creates a new volume group called VolumeGroupName using the block special device PhysicalDevicePath. ufw (Uncomplicated Firewall) - > A Linux program for managing a netfilter firewall designed to be easy to use. iperf (Internet Performance) - > A cross-platform tool used for network performance measurement and tuning. mtr (My Traceroute) - > A Linux network diagnostic tool that combines ping and traceroute into one program. dig (Domain Information Groper) - > Linux command used for retrieving information about DNS name servers. /etc/resolv.conf - > Linux file that defines how the system uses DNS to resolve hostnames. lscpu - > Lists CPU information in Linux, including Architecture, number of Cores, Vendor ID, CPU Family, Name, Model, etc...

lsmem - > Lists the ranges of available memory in a system, along with their online status. Memory Leak - > An occurrence that happens when a process allocates memory from the paged or nonpaged pools, but doesn't free the memory. Zombie Process - > A process that has completed execution but still has an entry in the process table. su - - > Switches to the root user account within the Linux terminal. ##/TCP or UDP - > Format for /etc/rsyslog.conf ports. xfs_repair - > Linux command used to repair damaged or corrupted XFS file systems. xfs_metadump - > A debugging tool that copies the metadata from an XFS filesystem to a file. xfs_admin - > Linux command used to change the parameters of an XFS Filesystem, and to view the file system label and UUID. xfs_info - > Displays geometry information about an existing XFS filesystem. lvresize (Logical Volume Resize) - > Linux command used to resize a logical volume. stat - > Linux command which gives information about the file and filesystem. semanage - > Used to configure certain elements of SELinux policy without requiring modification to or recompilation from policy sources. sestatus - > Used to get the status of a system running SELinux. getsebool - > Shows the current state of a particular SELinux boolean or a list of booleans. setsebool - > Sets the current state of a particular SELinux boolean or a list of booleans to a given value.

Targeted (SELinux) - > Policy where everything is allowed unless explicitly denied. Strict (SELinux) - > Policy where everything is denied by default, requiring that you must specify allow privileges for users. Minimum (SELinux) - > Policy where everything is allowed unless explicitly denied, and uses the base policy package. /etc/ssh/ssh_config - > File used to make and manage client SSH client settings within Linux. ~/.ssh/known_hosts - > File used to store public keys of a remote system(s) that a Linux workstation has previously connected to. autorelabel (SELinux) - > An optional entry that allows the file system to be relabeled. system booleans (SELinux) - > Allows parts of SELinux policy to be changed at runtime, without any knowledge of SELinux policy writing. nice - > Linux command that lets you run a command at a priority lower than the command's normal priority. kill - > Linux command used to terminate a process. lsof - > Lists all open files into the output console. renice - > Alters the nice value of one or more running processes. /etc/dnf/dnf.conf - > A Linux file/directory that contains the DNF's global settings. rmmod - > Linux command used to remove a module from the kernel. insmod - > Linux command used to insert modules into the kernel. modinfo - > Linux command used to display the information about a Linux Kernel module.

resolvectl - > Linux command used to resolve domain names, IPV4 and IPv6 addresses, DNS resource records, and services; introspect and reconfigure the DNS resolver. ifcfg - > Linux command used to set network interface parameters. min hr * * day - > Format for setting backup times (with number values) within a Linux server. dnf - > A software package manager that installs,. updates, and removes packages on Fedora. Soft Links - > A file whose purpose is to point to a file or directory by specifying a path thereto. Hard Links - > A link that directly associates a name with a given file in an operating system. /etc/apt.conf - > The main configuration file shared by all the tools in the APT suite. cpio (Copy In, Copy Out) - > Linux command used for processing archive files. awk - > A scripting language used for manipulating data and generating reports. /etc/ntp.conf - > Linux file used for configuring information about the NTP (Network Time Protocol) Daemon. dmidecode - > Linux command used for when the user wants to retrieve system's hardware related information such as CPU, RAM, BIOS, Serial Numbers, etc... firewall-cmd --zone=zone --remove-port=xx/tcp or udp - > Command used to remove a specific port from a zone in a Linux firewall. X11 Forwarding - > An SSH protocol that enables users to run graphical applications on a remote server and interact with them using their local display and I/O devices.

pkexec (PolKit Execution) - > Linux command used to allow an authorized user to execute a piece of code as another user. pkaction (PolKit Action) - > Linux command used to obtain information about registered polkit actions. pkcheck (PolKit Check) - > Linux command used to check whether a specified process is authorized for action. pkttyagent - > Linux command used to start a textual authentication agent for the subject specified by either --process or --system-bus-name. docker rmi - > Docker command used to remove one or more images. docker stop - > Docker command used to stop one or more running containers. docker start - > Docker command used to start one or more containers. | (Bash) - > Redirector used to take the output from one command and use it as the input to a second command. & (Bash) - > Operator used to run a Bash script in the background. ? - > Metacharacter used during globbing to represent a single character. podman rmi [ID] - > Linux command used to delete a container image from the current list of available containers on a Linux server. podman push - > Linux command used to push an image, manifest list or image index from local storage to elsewhere podman images - > podman ps - a - > Cloud-init - >

Ansible - > /proc/partitions - > tshark - > What - > Section under the [Mount] section of the .mount file used to identify the absolute path to a storage device. Type - > Section under the [Mount] section of the .mount file used to identify the filesystem type. OnBootSec - > vmstat - > Displays the amount of virtual memory used. systemctl mask - > systemctl start - > systemctl stop - > systemctl status - > cat /etc/timezone - > Command used to quickly identify the time zone of a Debian-based server. sudo renice - {VALUE} ./custom.exe - > Command used to increase the CPU priority of custom software on a Linux server. firewall-cmd --zone=zone --list-all - > Command used to display the current list of allowed ports for a server's firewall.