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Browse all Linuxize tutorials, guides, and references.
ssh-copy-id Command: Copy SSH Keys to a Remote Server
How to use the ssh-copy-id command to copy your SSH public key to a remote server and set up passwordless login. Covers options, a manual fallback, and common errors.
ls Command in Linux: List Files and Directories
The ls command lists files and directories in Linux. See how to use ls -l, ls -al, hidden-file options, sorting, and other practical combinations.
Find Large Files in Linux: Using find and du
Find the largest files and directories in Linux using the find and du commands. Includes practical examples for sorting by size and cleaning up disk space.
Cron Every 5 Minutes: 5, 10, and 15-Minute Crontab Examples
Run cron every 5 minutes with */5 * * * *. This guide also covers 10 and 15-minute crontab expressions, testing, logging, and overlap prevention.
btop Command in Linux: Monitor System Resources
Monitor CPU, memory, disks, network traffic, and processes with btop. This guide covers installation, keyboard shortcuts, process actions, and configuration.
Bash source Command: Load Scripts and Variables
Use source (or its dot shorthand) to run a file in your current shell, reload .bashrc, share functions between scripts, and load variables from a config file.
Listing Linux Services with systemctl
Use the systemctl command to list running, failed, and enabled Linux services. Includes filtering by state, checking status, and listing unit files.
Crontab: Scheduling Cron Jobs in Linux
Cron is a Linux scheduling daemon that runs tasks at defined intervals. This guide explains crontab syntax, operators, predefined macros, environment variables, and practical scheduling examples.
CPU Info on Linux: Check CPU Details from the Command Line
Read CPU model, core and thread counts, cache sizes, and virtualization support on Linux from the command line with /proc/cpuinfo, lscpu, and dmidecode.
ps Command in Linux: ps aux and Common Options
Use ps aux and related ps command options in Linux to list running processes, read output columns, sort by CPU or memory, filter by PID or user, and show full command lines.
Check Open Ports in Linux: nmap, netcat, and Bash
Scan a Linux host or remote server for open ports with nmap, netcat, telnet, and Bash /dev/tcp, then distinguish closed ports from filtered connections.
ss Command in Linux: Display Socket Statistics
Use the ss command to list TCP, UDP, and Unix sockets, filter by port and state, read queue columns, inspect timers, and replace common netstat commands.
How to Open a Port in the Firewall on Linux
Open a port in a Linux firewall with ufw, firewalld, nftables, or iptables, then make the rule persistent and test remote access.
PHP Error Reporting: Enable, Display, and Log Errors
Step-by-step instructions for configuring PHP error reporting. Covers error levels, display_errors, error_log, php.ini settings, and runtime configuration with error_reporting().
dnf Command in Linux: Install, Update, and Manage Packages
Common dnf commands for installing, updating, removing, searching, and managing packages on Fedora, RHEL, Rocky Linux, AlmaLinux, and other RPM-based systems.
How to List Installed Packages on Debian with apt and dpkg
See what is installed on Debian, which packages you chose yourself, which use the most disk space, and when each one arrived, using apt and dpkg-query.
What Is .bashrc? When It Runs and What to Put in It
~/.bashrc controls aliases, functions, prompts, and other interactive Bash settings. See when it runs, what belongs inside it, and how to reload changes.
How to Create a tar.gz File in Linux
Create tar.gz and tgz files in Linux with the tar command. Covers directories, wildcards, exclusions, archive paths, and the -C option.
Best Linux Distros for Every Use Case in 2026
Compare the best Linux distros for beginners, gaming, servers, and security testing, with current versions and a straight answer on which one to install first.
How to Create Bash Aliases
Bash aliases let you shorten long commands into short, memorable shortcuts. This guide covers alias syntax, persistent aliases in .bashrc, and bash functions for shortcuts that take arguments.
