Linux Commands
Command references for core Linux tools, syntax, examples, and practical one-liners.
rpm Command in Linux: Install, Query, and Verify Packages
Use the rpm command in Linux to install, upgrade, remove, query, and verify RPM packages on Fedora, RHEL, AlmaLinux, Rocky Linux, and other RPM-based distributions.
How to Transfer Files with Rsync over SSH
Use rsync over SSH to copy and synchronize files and directories between local and remote systems, with examples for custom ports, dry runs, compression, and progress display.
pstree Command in Linux: View the Process Tree
Use the pstree command in Linux to display running processes as a tree, show PIDs and PGIDs, trace parent processes, and highlight specific branches.
Linux File Permissions Explained
Linux file permissions control who can read, write, and execute files and directories. This guide explains permission classes, symbolic and numeric chmod modes, and special bits such as setuid, setgid, and the sticky bit.
du Command in Linux: Check Disk Usage
The du command reports disk space used by files and directories. This guide covers human-readable output, summary totals, depth limiting, sorting by size, and practical examples.
Understanding the /etc/passwd File
The /etc/passwd file stores user account information on Linux. Each line contains seven colon-separated fields: username, password placeholder, UID, GID, GECOS, home directory, and login shell.
type Command in Linux: Show Command Type and Location
The type command shows whether a name is a shell builtin, alias, function, keyword, or executable file, and how the current shell resolves it.
How to Check Memory Usage in Linux
Step-by-step guide to checking RAM usage in Linux using free, top, /proc/meminfo, and ps_mem — with examples for megabytes, gigabytes, and per-process memory.
Linux ip Command with Examples
A practical guide to the Linux ip command: show and configure network interfaces, assign IP addresses, manage routes, and inspect the ARP table with real examples.
How to Rename Files and Directories in Linux
Rename files and directories in Linux using mv for single renames and rename for batch filename changes, including extension changes, case conversion, and safe previews.
chown Command in Linux: Change File Ownership
Use the chown command in Linux to change file and directory ownership, including recursive changes, symbolic links, and practical ownership examples.
How to Create a systemd Service File in Linux
Create a systemd service file in Linux with step-by-step instructions for unit file structure, service types, restart policies, and service management with systemctl.
How to Create Users in Linux (useradd Command)
Learn how to create and add users in Linux with the useradd command, including home directories, passwords, groups, shells, UIDs, and other common account options.
last Command in Linux: Check Login History
Use the last command in Linux to check login history, filter sessions by user or date, and audit system access. Also covers lastb for failed logins and lastlog for per-user login records.
Linux Watch Command
Use the watch command in Linux to run commands at regular intervals and monitor output changes in the terminal. Includes interval, highlighting, pipes, and practical examples.
ls Command in Linux: List Files, Directories, and Hidden Files
Use the ls command in Linux to list files and directories, show hidden files, sort output, and read long listings. Includes practical ls options and common command combinations.
How to Remove (Delete) Files and Directories in Linux
Learn how to delete files and directories in Linux using the rm, rmdir, unlink, and shred commands, with examples for single files, wildcards, recursive removal, and safe deletion workflows.
xargs Command in Linux: Usage and Examples
The xargs command builds and executes commands from standard input. This guide covers the most useful xargs options with practical examples.
locate Command in Linux: Find Files Quickly
Search for files and directories by name using the locate command in Linux. Covers installation, database updates, pattern matching, and common options.
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.
