50 Powerful Linux Commands You Must Know (With Examples)

This 50 powerful Linux commands cover everything you need to work confidently at the terminals, which are categorized into eight (8) different categories with examples that have been tested on RHEL, Rocky Linux, and Ubuntu . Additionally, each command example has working terminal output examples for your reference prior to executing the command.

Examples

Most Linux users only scratch the surface; these 50 commands unlock real power

These ten (10) commands allow you to interact with the file system and include: create and remove files, copy and move data, and search for anything on disk. You will use them every single time you open a terminal.

The ls command which displays the contents of a directory. When combined with the -lah option it also displays: the size of the items contained within the directory in human readable format; their permissions; who owns them; what group they belong to; and when the item was modified. It also includes display of hidden files. For additional reading on how to properly utilize the ls command refer to our Basic ls Command Tutorial.

Using Absolute Paths and Relative Paths; The cd (change directory) command lets you move to different folders based on their absolute paths, relative paths, and shortcuts. Look to the cd command tips guide for more about how to navigate the folder structure with ease.

The pwd command will give you the full absolute path of where you're currently located. This is useful when you want to paste a path into a script or config file and don't have to guess the path.

The mkdir command creates new directories. When combined with -p , the mkdir command creates all parts of the directory tree needed to create a specified directory structure in a single command. It also won’t throw an error if any part of the directory already exists. Therefore, it’s safe to run this command in scripts.

The rm (remove) command will delete files and folders. With -r it will remove the entire directory tree recursively. Also, there is no recycle bin (trash), no “undo”, and no prompts asking if you’re sure unless you add -i.

The cp command will copy files and directories. Adding -r will make the cp command do a recursive copy. The -p option will preserve the original permissions, ownership, and timestamp(s) of the copied item(s). Use the file management commands guide to learn more about these patterns.

The mv command can be used to rename files and/or to move them. Since renaming/moving a file in the same file system is essentially updating the directory entry associated with that file’s name rather than actually moving/copying the file’s data itself, renaming/moving a file within the same file system is immediate.

The find command searches for files in your file system that meet the criteria you specify, file name, file type, file size, file owner, file permissions, or date modified. In addition to being very useful for removing older logs, it is also useful for finding config files. The find command guide has much more information regarding searching for files using various parameters.

The touch command will create an empty file if it doesn’t already exist. If it does exist, it will update its timestamps. Both functions are useful in scripts, creating placeholders and causing processes that depend upon the last-modified-date of a file to refresh the age of the file.

The tree command displays your directory hierarchy graphically. By adding the -L you can limit how deep in the directory hierarchy the tree ommand will display. Without specifying this option, the tree command can generate hundreds of lines if you have a lot of subdirectories in your current working directory. To install tree if it isn’t installed yet, enter either of the two following commands: sudo apt install tree or sudo dnf install tree.

All File Data is Stored as Text; Most Everything Is Stored As Text Files Under Linux. Configs, logs, scripts, and user databases are almost always stored as text files under Linux. And since you can read/search/filter/transform that text without having to open a GUI editor using the eight above-mentioned commands, they work very well together with pipes. For additional info, please refer to the text processing commands reference.

The cat (concatenate) command is probably one of the fastest ways to print out the contents of a small config or script to the terminal. However, since cat sends all of the file at once, use less if you are dealing with larger files. The cat command guide rovides additional usage examples of cat.

The less command allows you to read a file in a scrolling environment, which means you can view files such as log files, man pages, and long config files page-by-page. Within less, search for a specific string by typing / followed by your search term and press Enter. Then press n to move down to the next occurrence of what you searched for.

The head (view header) command prints the first few lines of a file or ten lines by default but you may specify any number of lines after -n. A common use-case would be viewing several lines of a log file to verify whether the format matches expectations before running a batch job against it.

The tail (view trailer) command views the last few lines of a file. The -f option will allow you to watch as data arrives in real-time, often useful when trying to reproduce problems while logging something in another window. For more ideas on tracking logs over time, please refer to the System Monitoring Cheat Sheet.

The grep command searches files or command output for lines matching a pattern. The -i flag makes the search case-insensitive, -r recurses through directories, and -n shows line numbers next to each match.

The awk command processes structured text, treating each line as a row of fields separated by a delimiter. Default is whitespace, change it with -F. It is the fastest way to pull a specific column out of command output or a structured file like /etc/passwd.

The sed command reads text line by line and applies transformations. The most common use is find-and-replace: s/old/new/g. Add -i to edit a file in-place, extremely useful for config automation in scripts and Ansible playbooks. The sed commands guide covers more advanced patterns. If you find yourself running the same commands repeatedly, see our guide to the best open source automation tools for 2026 to take your workflows further.

The wc command counts lines, words, and characters in a file or stream. The -l flag counts only lines, the most common use case. Piping other commands into wc -l is a quick way to count almost anything.

Linux permissions control who can read, write, and execute every file and directory. Getting them right is how you keep a server secure and prevent services from interfering with each other. The chmod command guide covers the full numeric and symbolic permission system.

The chmod command sets who can read, write, and execute a file. In numeric notation each digit represents owner, group, and others; 4 is read, 2 is write, 1 is execute. So 755 means the owner can do everything while group and others can only read and execute.

The chown command changes the owner and optionally the group of a file or directory. You need root or sudo to use it on files you do not own. The format is user:group, set both at once, or leave off the group to change only the owner.

The chgrp command changes only the group ownership of a file, leaving the user owner unchanged. Useful in shared environments where multiple users work in the same project directory via a shared group.

The umask command controls what permissions are removed from newly created files and directories. A umask of 022 subtracts write from group and others, resulting in files created as 644 and directories as 755, the standard default on most Linux systems.

When something goes wrong, the first thing you need is visibility. These 8 commands show you CPU, memory, disk, and uptime in seconds. The system monitoring cheat sheet and the best Linux monitoring tools guide cover more advanced options.

The top command is the built-in real-time process monitor on virtually every Linux system. It shows CPU, memory, load average, and a sorted list of running processes — usually the first place you check when a server is slow. See the top command guide for shortcuts and filtering options.

The htop command is an improved, color-coded, mouse-enabled version of top. It shows per-core CPU bars, displays memory visually, and lets you scroll, filter, and kill processes interactively. Install with sudo apt install htop or sudo dnf install htop.

The ps command gives a snapshot of running processes at the moment you run it. ps aux shows every process from all users including the command that started it. Pipe into grep to check if a service is running and get its PID. The ps command guide covers more filtering options.

The df command reports disk space used and available on each mounted filesystem. The -h flag shows sizes in GB/MB. Running out of disk space is one of the most common causes of sudden service failures, df -h belongs on every troubleshooting checklist. See the df command guide.

The du command shows how much disk space a directory and its contents use. Where df shows filesystem totals, du drills down to individual directories. The -s flag shows a summary total, -h keeps sizes readable. See the du command guide.

The free command shows how much RAM and swap is used and available. The "available" column is more meaningful than "free", Linux uses spare RAM for disk caching, and that cache is released immediately when a process needs it.

The uname command reports the kernel version and system architecture. The -r flag shows just the kernel release, what you need most when checking compatibility or researching a kernel bug. Use -a to show everything at once.

The uptime command prints system uptime, logged-in user count, and load averages for the last 1, 5, and 15 minutes. A load average roughly equal to the number of CPU cores means the system is fully utilized — higher means processes are waiting.

These 4 commands let you stop processes by ID or name, check what is running in the background, and keep long-running tasks alive after you disconnect. For more patterns, see the Linux process management cheat sheet.

The kill command sends a signal to a process by PID. Signal -15 (SIGTERM) asks the process to shut down gracefully. Signal -9 (SIGKILL) forces immediate termination with no cleanup. Always try -15 first.

The pkill command kills processes by name pattern, no need to look up a PID first. It sends the signal to all matching processes, which is handy when a service has multiple worker processes.

The jobs command shows processes you have sent to the background using & or Ctrl+Z. Each job gets a number you can use with fg %1 to bring it to the foreground, or bg %1 to resume it in the background. The -l flag also shows each job's PID.

The nohup command makes a process ignore the SIGHUP signal sent when your SSH session ends, so it keeps running after you log out. Combine with & to send it to the background immediately. Output goes to nohup.out by default unless you redirect it.

Networking commands are core sysadmin skills on Linux. These 8 commands cover connectivity testing, file transfers, port inspection, SSH access, and remote file synchronization. For a deeper look, see the Linux network administration guide and the 8 Linux networking commands guide.

The ping command sends ICMP echo packets to a host and reports round-trip time. It is the quickest check for whether a host is reachable. The -c 4 flag limits the test to 4 packets so it stops automatically.

The curl command transfers data to or from a URL over HTTP, HTTPS, FTP, and more. Use it to test API endpoints, check HTTP response headers, and download files from the command line. The -I flag fetches headers only, great for quickly checking a server's status code. See the curl command guide for more patterns.

The wget command downloads files from the web and saves them to disk automatically. It supports resuming interrupted downloads with -c and background downloads with -b, the go-to tool on headless servers with no browser.

The ss command is the modern replacement for netstat. The flags -tlnp show TCP listening ports with the process name and PID attached, the combination you will reach for most often. See the Linux network command cheat sheet for more examples.

The ip command is the modern replacement for ifconfig. It shows and configures network interfaces, IP addresses, and routing tables. The most common use is ip addr show to see what addresses are assigned to each interface.

The ssh command opens an encrypted terminal session to a remote Linux machine, how virtually all remote server management is done. Authenticate with a password or, much better, an SSH key pair. The SSH client commands guide and the install and secure SSH server guide cover key setup and hardening.

The scp command copies files between machines over an encrypted SSH connection. The syntax mirrors cp with a user@host: prefix for the remote side. It uses the same authentication as SSH, password or key.

The rsync command synchronizes files and directories, transferring only what has changed. This makes it much faster than scp or cp for large directory trees where only a few files have been updated. The -avz flags enable archive mode, verbose output, and compression.

Package managers handle installing, updating, and removing software on Linux. Debian and Ubuntu use apt, RHEL and Fedora use dnf, and snap works across distributions. The Linux package management cheat sheet has a full comparison of flags across all package managers.

The apt command is the primary package manager on Debian-based systems. Always run sudo apt update first to refresh the package list before installing or upgrading, otherwise you may get outdated versions or errors about packages that cannot be found.

The dnf command is the package manager for RHEL 8+, CentOS Stream, Rocky Linux, AlmaLinux, and Fedora. It replaced yum starting with RHEL 8, most syntax is identical. The DNF guide for beginners is a good next step for RPM-based systems.

The rpm command works directly with the RPM package database. While dnf handles dependencies and repositories, rpm is useful for querying what is installed, verifying package integrity, and installing individual .rpm files. The -qa flags list every package currently installed.

The snap command manages self-contained, sandboxed application bundles that work across multiple Linux distributions. Snaps bundle their own dependencies, so the same package installs identically on Ubuntu, Fedora, Debian, and others without conflicts. The tradeoff is larger package size and potentially slower startup.

Managing users and running system-level operations requires elevated privileges. These commands are where mistakes can have serious consequences; read the notes carefully. The user management cheat sheet and the steps to configure sudo guide are worth reading alongside this section.

The sudo command runs a single command with root privileges without switching you to the root account permanently. It logs every privileged action, creating an audit trail. This is far safer than logging in as root and is the standard way to perform administrative tasks on modern Linux.

The useradd command creates a new user account. The -m flag creates the home directory automatically and -s /bin/bash sets bash as the default shell. Without -m the user has no home directory, which causes login problems. Always set a password with passwd immediately after. See the create user guide for UID, group, and expiry options.

The passwd command changes a user's password. Run without arguments to change your own. Run with a username as root or with sudo to change another user's password. A newly created user has a locked account until a password is set, passwd is always the step right after useradd.

The dd command copies raw data at a low level between an input source (if=) and an output destination (of=). It is used for creating disk images, cloning drives, and writing bootable ISO images to USB drives. The bs=4M flag sets the block size which affects transfer speed.

Thanks for reading! Hope this breakdown of 50 Linux commands saves you some time at the terminal. If you found it useful, share it with someone who is just getting started with Linux. Drop your questions or feedback in the comments below.