Linux Commands (original) (raw)

Last Updated : 12 May, 2026

Linux commands allow users to control and manage the system using the terminal, which works similarly to the Command Prompt in Windows.

Used to manage files and directories, such as creating, deleting, copying, and organizing data.
Helps monitor and control system resources including processes, memory, and CPU usage.
Allows administrators to manage users, permissions, software packages, and system services.
Supports networking, automation, and troubleshooting through powerful command-line tools.

Here is a list of Linux operations divided under broad categories:

1. File Operations Commands

File operations commands are used to manage files within a computer system. They allow users to create, access, modify, organize, and remove files efficiently, ensuring smooth handling of data.

These commands help in generating new files and making changes to the content of existing files.
Users can display file data in readable, paged, or formatted output without modifying the file.
Files can be removed from the system, either normally or in a way that prevents recovery.

2. Directory Operations Commands

Directory operations commands are used to manage folders within the filesystem. They help users navigate, organize, and maintain the directory structure efficiently.

They display the contents of directories in various formats for better understanding.
They help analyze directory size and storage usage.

3. File Permission and Ownership Commands

File permission and ownership commands control access to files and directories. They ensure that only authorized users can access or modify data.

These commands define read, write, and execute permissions for files.
Ownership of files can be assigned to specific users.
Group ownership can be managed for shared access.
Sensitive files can be protected from unauthorized access.

4. User Management Commands

User management commands are used to handle user accounts in a multi-user system. They help administrators manage access and authentication.

New user accounts can be created and removed when required.
Existing user details and privileges can be modified.
Password policies and expiration can be controlled.
User identity and login details can be viewed.
Active users on the system can be monitored.

5. Group Management Commands

Group management commands organize users into groups. They simplify permission handling and improve collaboration.

New groups can be created for users with similar roles.
Users can be added to or removed from groups.
Group-level permissions can be managed efficiently.
Group configuration integrity can be verified.
Membership details of users can be displayed.

6. Process Management Commands

Process management commands monitor and control running programs. They help maintain system performance and stability.

Running processes can be viewed and analyzed.
Processes can be started, paused, or terminated.
CPU and memory usage can be monitored.
System performance issues can be identified.

7. Terminal and Session Management Commands

Terminal and session management commands are used to control and manage terminal sessions and their input/output behavior. They help users handle multiple sessions efficiently and adjust terminal settings for smooth interaction.

These commands allow users to create, switch, and manage multiple terminal sessions.
User input and output behavior can be controlled for better usability.
Terminal sessions can be reset or restored when issues occur.

8. Job Scheduling Commands

Job scheduling commands automate task execution. They reduce manual effort and improve efficiency.

Tasks can be scheduled to run at a specific time.
Repetitive jobs can be automated.
System maintenance can be automated.

9. Disk and File System Commands

Disk and file system commands manage storage devices and data organization. They ensure disk health and reliability.

Disk partitions can be created and modified.
File systems can be mounted or unmounted.
Disk space usage can be checked.
File system errors can be detected and repaired.
Data can be backed up and restored.

10. Hardware and System Information Commands

Hardware and System Information Commands display information about system hardware and resources. They help in monitoring and troubleshooting.

CPU, memory, and storage details can be viewed.
Connected hardware devices can be identified.
System performance statistics can be monitored.
Kernel and boot messages can be examined.
Hardware health can be analyzed.

11. Networking Commands

Networking commands manage network configuration and communication. They help troubleshoot connectivity issues.

Network interface status can be checked.
Connectivity between systems can be tested.
Data can be transferred across networks.
Network traffic can be monitored.
Routing and firewall rules can be managed.

12. Package Management Commands

Package management commands manage software installation and updates. They simplify application handling.

Software packages can be installed or removed.
System packages can be updated.
Dependency issues can be resolved.
Available software can be searched.
System consistency can be maintained.

13. Compression and Archiving Commands

Compression and Archiving Commands reduce file size and bundle multiple files. They improve storage and transfer efficiency.

Files can be compressed to save space.
Archived files can be created.
Compressed data can be extracted.
Archived files can be compared.
Backup storage can be optimized.

14. Text Processing and Formatting Commands

Text processing commands are used to manipulate, filter, and analyze text data in files or command output. They are essential tools in scripting and automation, helping users extract meaningful information and transform data efficiently.

Search, filter, and modify text data
Process file contents line by line
Combine with pipes for powerful automation
Widely used in log analysis and data processing

15. Checksum and File Integrity Commands

Checksum and file integrity commands are used to verify the accuracy and consistency of files using hash values. They help detect file corruption, accidental changes, or unauthorized modifications to ensure data security and reliability.

These commands generate unique hash values for files based on their content.
They help verify whether a file has been altered or damaged during transfer or storage.
File authenticity can be confirmed by comparing checksum values.
They assist in detecting unauthorized or malicious changes to files.
They are widely used to ensure secure file downloads and data integrity.

16. Shell Built-in and Scripting Commands

Shell built-in commands are essential components of a shell that control script execution and enable task automation using built-in features along with external commands. They provide the core functionality required for writing efficient, fast, and flexible shell scripts.

Allow definition and management of variables and functions within scripts
Support conditional statements for decision-making logic
Enable loops to perform repeated tasks automatically
Handle user input and automate routine system operations

17. Development and Build Automation Commands

Development and build automation commands are used to compile source code, build executables, debug programs, and analyze software behavior. They support efficient software development and automate the build process.

These commands help convert source code into executable programs.
They allow developers to debug applications and identify errors.
Build processes can be automated to save time and reduce manual effort.
Program binaries can be analyzed for performance and correctness.
They support the use of development tools throughout the software lifecycle.

18. Kernel and Module Management Commands

Kernel and Module Management Commands manage kernel modules and services. They control low-level system operations.

Kernel modules can be loaded or removed.
Module information can be displayed.
System services can be controlled.
Kernel behavior can be adjusted.
Hardware support can be managed.

19. System Control and Power Commands

System control commands manage system startup and shutdown. They ensure safe power operations.

Systems can be shut down safely.
Reboots can be performed when required.
Power operations can be scheduled.
Emergency stops can be handled.
Data loss can be prevented.

20. Logging and Monitoring Commands

Logging & Monitoring commands track system activity and events. They help in auditing and troubleshooting.

System logs can be viewed.
User login history can be tracked.
Performance data can be monitored.
Terminal activity can be recorded.
System behavior can be analyzed.

21. Mail and User Communication Commands

Mail and user communication commands are used for sending messages, notifications, and alerts between users in a multi-user system. They help administrators and users communicate effectively and manage system-related messages.

These commands allow users to send direct messages to other logged-in users.
System-wide announcements and notifications can be broadcast to all users.
Mail queues can be monitored and managed efficiently.
Users can be informed about system events or maintenance activities.

22. Date and Time Commands

Date and time commands manage system time settings. They support scheduling and logging.

Current date and time can be displayed.
Calendar information can be viewed.
System uptime can be checked.
Scheduled tasks rely on accurate time.
Logs maintain correct timestamps.

23. Printing and Media Commands

Printing and media commands are used to manage printing services, audio output, and media-related devices in a computer system. They help users control sound, handle printers, and work with removable media efficiently.

These commands allow users to manage and control printing services and print jobs.
Audio output and sound settings can be adjusted and tested.
Media files such as audio can be played through system devices.
Removable media devices can be mounted, accessed, or ejected safely.

24. Help and Documentation Commands

Help & Documentation commands provide information about system usage. They assist users in learning commands.

Manual pages can be accessed.
Command descriptions can be searched.
Detailed documentation can be viewed.
Command locations can be identified.
Users can understand correct usage.