RetroSearch Browse

Home - News ( United States | United Kingdom | Italy | Germany ) - Football scores

Showing content from https://www.geeksforgeeks.org/linux-unix/linux-commands-cheat-sheet/ below:

Linux Commands Cheat Sheet - GeeksforGeeks

Linux, often associated with being a complex operating system primarily used by developers, may not necessarily fit that description entirely. While it can initially appear challenging for beginners, once you immerse yourself in the Linux world, you may find it difficult to return to your previous Windows systems. The power of Linux commands in controlling your PC, coupled with their clean user interface, can make it hard to switch back to older operating systems. If you're a developer, you can likely relate to the advantages and appeal of Linux.

To support developers and beginners alike, we have created a comprehensive Linux/Unix command line cheat sheet. This cheat sheet covers all the basic and advanced commands, including file and directory commands, file permission commands, file compression and archiving, process management, system information, networking, and more with proper examples and descriptions. In addition to that we provide all the most used Linux Shortcut which includes Bash shortcuts, Nano shortcuts, VI & Vim Shortcuts Commands. It provides a solid foundation on Linux OS commands, as well as insights into practical applications.

By the end of this cheat sheet, you will have a basic understanding of Linux/Unix Commands and how it makes development easy for developers.

Linux Commands Cheat Sheet

What is Linux?

Linux is an open-source UNIX-like operating system (OS). An operating system is a software that directly manages a system’s hardware and resources, like CPU, memory, and storage. OS acts as a GUI through which user can communicate with the computer. The OS sits between applications and hardware and makes the connections between all of your software and the physical resources that do the work.

Linux Commands List - Table of Content

File and Directory Operations Commands

File Permission Commands

File Compression and Archiving Commands

Process Management Commands

System Information Commands

Networking Commands

IO Redirection Commands

Environment Variable Commands

User Management Commands

Shortcuts Commands List

Bash Shortcuts Commands

Nano Shortcuts Commands

VI Shortcuts Commands

Vim Shortcuts Commands

FAQs on Linux Commands Cheat Sheet

Basic Linux Commands with Examples

In this Linux cheat sheet, we will cover all the most important Linux commands, from the basics to the advanced. We will also provide some tips on how to practice and learn Linux commands. This cheat sheet is useful for Beginners and Experience professionals.

1. File and Directory Operations Commands

File and directory operations are fundamental in working with the Linux operating system. Here are some commonly used File and Directory Operations commands:

Command

Description

Options

Examples

ls List files and directories.

-l: Long format listing.
-a: Include hidden files hidden ones
-h: Human-readable file sizes.

ls -l
displays files and directories with detailed information.
ls -a
shows all files and directories, including
ls -lh
displays file sizes in a human-readable format.

cd Change directory.

cd /path/to/directory
changes the current directory to the specified path.

pwd Print current working directory.

pwd
displays the current working directory.

mkdir Create a new directory.

mkdir my_directory
creates a new directory named "my_directory".

rm Remove files and directories.

-r: Remove directories recursively.
-f: Force removal without confirmation.

rm file.txt
deletes the file named "file.txt".
rm -r my_directory
deletes the directory "my_directory" and its contents.
rm -f file.txt
forcefully deletes the file "file.txt" without confirmation.

cp Copy files and directories.

-r: Copy directories recursively.

cp -r directory destination
copies the directory "directory" and its contents to the specified destination.
cp file.txt destination
copies the file "file.txt" to the specified destination.

mv Move/rename files and directories.

mv file.txt new_name.txt
renames the file "file.txt" to "new_name.txt".
mv file.txt directory
moves the file "file.txt" to the specified directory.

touch Create an empty file or update file timestamps.

touch file.txt
creates an empty file named "file.txt".

cat View the contents of a file.

cat file.txt
displays the contents of the file "file.txt".

head Display the first few lines of a file.

-n: Specify the number of lines to display.

head file.txt
shows the first 10 lines of the file "file.txt".
head -n 5 file.txt
displays the first 5 lines of the file "file.txt".

tail Display the last few lines of a file.

-n: Specify the number of lines to display.

tail file.txt
shows the last 10 lines of the file "file.txt".
tail -n 5 file.txt
displays the last 5 lines of the file "file.txt".

ln Create links between files.

-s: Create symbolic (soft) links.

ln -s source_file link_name
creates a symbolic link named "link_name" pointing to "source_file".

find Search for files and directories.

-name: Search by filename.
-type: Search by file type.

find /path/to/search -name "*.txt"
searches for all files with the extension ".txt" in the specified directory.

2. File Permission Commands

File permissions on Linux and Unix systems control access to files and directories. There are three basic permissions: read, write, and execute. Each permission can be granted or denied to three different categories of users: the owner of the file, the members of the file's group, and everyone else.

Here are some file permission commands:

Command

Description

Options

Examples

chmod Change file permissions.

u: User/owner permissions.
g: Group permissions.
o: Other permissions.
+: Add permissions.
-: Remove permissions.
=: Set permissions explicitly.

chmod u+rwx file.txt
grants read, write, and execute permissions to the owner of the file.

chown Change file ownership.

chown user file.txt
changes the owner of "file.txt" to the specified user.

chgrp Change group ownership.

chgrp group file.txt
changes the group ownership of "file.txt" to the specified group.

umask Set default file permissions.

umask 022
sets the default file permissions to read and write for the owner, and read-only for group and others.

3. File Compression and Archiving Commands

Here are some file compression and archiving commands in Linux:

Commands

Description

Options

Examples

tar Create or extract archive files.

-c: Create a new archive.
-x: Extract files from an archive.
-f: Specify the archive file name.
-v: Verbose mode.
-z: Compress the archive with gzip.
-j: Compress the archive with bzip2.

tar -czvf archive.tar.gz files/
creates a compressed tar archive named "archive.tar.gz" containing the files in the "files/" directory.

gzip Compress files.

-d: Decompress files.

gzip file.txt
compresses the file "file.txt" and renames it as "file.txt.gz".

zip Create compressed zip archives.

-r: Recursively include directories.

zip archive.zip file1.txt file2.txt
creates a zip archive named "archive.zip" containing "file1.txt" and "file2.txt".

4. Process Management Commands

In Linux, process management commands allow you to monitor and control running processes on the system. Here are some commonly used process management commands:

Commands

Description

Options

Examples

ps Display running processes.

-aux: Show all processes.

ps aux
shows all running processes with detailed information.

top Monitor system processes in real-time.

top
displays a dynamic view of system processes and their resource usage.

kill Terminate a process.

-9: Forcefully kill a process.

kill PID
terminates the process with the specified process ID.

pkill Terminate processes based on their name.

pkill process_name
terminates all processes with the specified name.

pgrep List processes based on their name.

pgrep process_name
lists all processes with the specified name.

grep used to search for specific patterns or regular expressions in text files or streams and display matching lines.

-i: Ignore case distinctions while searching.
-v: Invert the match, displaying non-matching lines.
-r or -R: Recursively search directories for matching patterns.
-l: Print only the names of files containing matches.
-n: Display line numbers alongside matching lines.
-w: Match whole words only, rather than partial matches.
-c: Count the number of matching lines instead of displaying them.
-e: Specify multiple patterns to search for.
-A: Display lines after the matching line.
-B: Display lines before the matching line.
-C: Display lines both before and after the matching line.

grep -i "hello" file.txt
grep -v "error" file.txt
grep -r "pattern" directory/
grep -l "keyword" file.txt
grep -n "pattern" file.txt
In these examples we are extracting our desirec output from filename (file.txt)

5. System Information Commands

In Linux, there are several commands available to gather system information. Here are some commonly used system information commands:

sudCommand

Description

Options

Examples

uname Print system information.

-a: All system information.

uname -a
displays all system information.

whoami Display current username.

whoami
shows the current username.

df Show disk space usage.

-h: Human-readable sizes.

df -h
displays disk space usage in a human-readable format.

du Estimate file and directory sizes.

-h: Human-readable sizes.
-s: Display total size only.

du -sh directory/
provides the total size of the specified directory.

free Display memory usage information.

-h: Human-readable sizes.

free -h
displays memory usage in a human-readable format.

uptime Show system uptime.

uptime
shows the current system uptime.

lscpu Display CPU information.

lscpu
provides detailed CPU information.

lspci List PCI devices.

lspci
List PCI devices.

lsusb List USB devices.

lsusb
lists all connected USB devices.

6. Networking Commands

In Linux, there are several networking commands available to manage and troubleshoot network connections. Here are some commonly used networking commands:

Command

Description

Examples

ifconfig Display network interface information.

ifconfig
shows the details of all network interfaces.

ping Send ICMP echo requests to a host.

ping google.com
sends ICMP echo requests to "google.com" to check connectivity.

netstat Display network connections and statistics.

netstat -tuln
shows all listening TCP and UDP connections.

ss Display network socket information.

ss -tuln
shows all listening TCP and UDP connections.

ssh Securely connect to a remote server.

ssh user@hostname
initiates an SSH connection to the specified hostname.

scp Securely copy files between hosts.

scp file.txt user@hostname:/path/to/destination
securely copies "file.txt" to the specified remote host.

wget Download files from the web.

wget http://example.com//file.txt
downloads "file.txt" from the specified URL.

curl Transfer data to or from a server.

curl http://example.com/
retrieves the content of a webpage from the specified URL.

7. IO Redirection Commands

In Linux, IO (Input/Output) redirection commands are used to redirect the standard input, output, and error streams of commands and processes. Here are some commonly used IO redirection commands:

Command

Description

cmd < file Input of cmd is taken from file. cmd > file Standard output (stdout) of cmd is redirected to file. cmd 2> file Error output (stderr) of cmd is redirected to file. cmd 2>&1 stderr is redirected to the same place as stdout. cmd1 <(cmd2) Output of cmd2 is used as the input file for cmd1. cmd > /dev/null Discards the stdout of cmd by sending it to the null device. cmd &> file Every output of cmd is redirected to file. cmd 1>&2 stdout is redirected to the same place as stderr. cmd >> file Appends the stdout of cmd to file. 8. Environment Variable Commands

In Linux, environment variables are used to store configuration settings, system information, and other variables that can be accessed by processes and shell scripts. Here are some commonly used environment variable commands:

Command

Description

export VARIABLE_NAME=value Sets the value of an environment variable. echo $VARIABLE_NAME Displays the value of a specific environment variable. env Lists all environment variables currently set in the system. unset VARIABLE_NAME Unsets or removes an environment variable. export -p Shows a list of all currently exported environment variables. env VAR1=value COMMAND Sets the value of an environment variable for a specific command. printenv Displays the values of all environment variables. 9. User Management Commands

In Linux, user management commands allow you to create, modify, and manage user accounts on the system. Here are some commonly used user management commands:

Command

Description

who Show who is currently logged in. sudo adduser username Create a new user account on the system with the specified username. finger Display information about all the users currently logged into the system, including their usernames, login time, and terminal. sudo deluser USER GROUPNAME Remove the specified user from the specified group. last Show the recent login history of users. finger username Provide information about the specified user, including their username, real name, terminal, idle time, and login time. sudo userdel -r username Delete the specified user account from the system, including their home directory and associated files. The -r option ensures the removal of the user's files. sudo passwd -l username Lock the password of the specified user account, preventing the user from logging in. su - username Switch to another user account with the user's environment. sudo usermod -a -G GROUPNAME USERNAME Add an existing user to the specified group. The user is added to the group without removing them from their current groups. 10. Shortcuts Commands

There are many shortcuts commands in Linux that can help you be more productive. Here are a few of the most common ones:

10.1: Bash Shortcuts Commands: Navigation Description Editing Description History Description Ctrl + A Move to the beginning of the line. Ctrl + U Cut/delete from the cursor position to the beginning of the line. Ctrl + R Search command history (reverse search). Ctrl + E Move to the end of the line. Ctrl + K Cut/delete from the cursor position to the end of the line. Ctrl + G Escape from history search mode. Ctrl + B Move back one character. Ctrl + W Cut/delete the word before the cursor. Ctrl + P Go to the previous command in history. Ctrl + F Move forward one character. Ctrl + Y Paste the last cut text. Ctrl + N Go to the next command in history. Alt + B Move back one word Ctrl + L Clear the screen. Ctrl + C Terminate the current command. Alt + F Move forward one word. 10.2: Nano Shortcuts Commands: File Operations Description Navigation Description Editing Description Search and Replace Description Ctrl + O Save the file. Ctrl + Y Scroll up one page. Ctrl + K Cut/delete from the cursor position to the end of the line. Ctrl + W Search for a string in the text. Ctrl + X Exit Nano (prompt to save if modified). Ctrl + V Scroll down one page. Ctrl + U Uncut/restore the last cut text. Alt + W Search and replace a string in the text. Ctrl + R Read a file into the current buffer. Alt + \ Go to a specific line number. Ctrl + 6 Mark a block of text for copying or cutting. Alt + R Repeat the last search. Ctrl + J Justify the current paragraph. Alt + , Go to the beginning of the current line. Ctrl + K Cut/delete the marked block of text. Alt + . Go to the end of the current line. Alt + 6 Copy the marked block of text. 10.3: VI Shortcuts Commands: Command Description cw Change the current word. Deletes from the cursor position to the end of the current word and switches to insert mode. dd Delete the current line. x Delete the character under the cursor. R Enter replace mode. Overwrites characters starting from the cursor position until you press the Escape key. o Insert a new line below the current line and switch to insert mode. u Undo the last change. s Substitute the character under the cursor and switch to insert mode. dw Delete from the cursor position to the beginning of the next word. D Delete from the cursor position to the end of the line. 4dw Delete the next four words from the cursor position. A Switch to insert mode at the end of the current line. S Delete the current line and switch to insert mode. r Replace the character under the cursor with a new character entered from the keyboard. i Switch to insert mode before the cursor. 3dd Delete the current line and the two lines below it. ESC Exit from insert or command-line mode and return to command mode. U Restore the current line to its original state before any changes were made. ~ Switch the case of the character under the cursor. a Switch to insert mode after the cursor. C Delete from the cursor position to the end of the line and switch to insert mode. 10.4: Vim Shortcuts Commands: Normal Mode Description Command Mode Description Visual Mode Description i Enter insert mode at the current cursor position. :w Save the file. v Enter visual mode to select text. x Delete the character under the cursor. :q Quit Vim. y Copy the selected text. dd Delete the current line. :q! Quit Vim without saving changes. d Delete the selected text. yy Copy the current line.

:wq

or

Save and quit Vim. p Paste the copied or deleted text. p Paste the copied or deleted text below the current line. :s/old/new/g Replace all occurrences of "old" with "new" in the file. u Undo the last change.

:set nu

or

:set number

Display line numbers. Ctrl + R Redo the last undo. Conclusion

In conclusion, Linux is a widely used operating system for development, and as a developer, you should have knowledge of Linux and its basic commands. In this Cheat Sheet, we covered all commands like creating directories, file compression and archiving, process management, system information, networking and more. In addition to that, this Linux Cheat Sheet is organized and categorized, making it easy for developers to quickly find the commands they need for specific use cases. By utilizing this resource, developers can enhance their productivity and efficiency in working with Linux, leading to smoother and more successful development projects.

PS. Don't miss our other Python cheat sheet for data science that covers Scikit-Learn, Bokeh, Pandas and Python basics.

RetroSearch is an open source project built by @garambo | Open a GitHub Issue

Search and Browse the WWW like it's 1997 | Search results from DuckDuckGo

HTML: 3.2 | Encoding: UTF-8 | Version: 0.7.4