"Linux Command-Line Specialist | Ubuntu Enthusiast"

File Crete:

• touch :Creates an empty file
• echo with redirection (> or >>): Writes text into a file using the echo command.
• cat: Can be used to create a new file by redirecting nothing into a file.
• printf : Creates and writes content into a file using the printf command.
• Text Editors (nano, vi, vim, emacs): ext editors can be used to create and edit files.
• dd if=/dev/zero of=output_file.txt bs=1024 count=10 : Can be used to create files of a specified size.
• truncate -s 1M filename.txt : Creates or shrinks a file to a specified size.This will create a file (filename.txt) with a size of 1MB.

File Operations:

• ls: List directory contents.
• cd: Change directory.
• pwd: Print working directory.
• mkdir: Make directory.
• rm: Remove files or directories.
• cp: Copy files or directories.
• mv: Move or rename files or directories.

File Viewing/Editing:

• cat: Display file content.
• more/less: View file content page-wise.
• nano/vi/vim: Text editors to create or modify files.

System Information:

• uname: Print system information.
• top/htop: Display system processes and resource usage.
• df: Show disk space usage.
• free: Display amount of free and used memory in the system.

User Management:

• useradd: Create a new user.
• userdel: Delete a user.
• passwd: Change user password.

Package Management:

• apt/yum/dnf: Package management tools for installing, updating, and removing software packages.
• apt-get install [package]: Install a package using APT.
• yum install [package]: Install a package using YUM.

Networking:

• ifconfig/ip: Show network configuration.
• ping: Check connectivity to a server.
• ssh: Securely connect to a remote server.
• scp: Securely copy files between machines.

Process Management:

• ps: Show current running processes.
• kill: Terminate a process.
• killall: Terminate processes by name.

File Permissions:

• chmod: Change file permissions.
• chown: Change file ownership.

Compression/Archiving:

• tar: Archive files.
• gzip/gunzip: Compress/decompress files.

System Shutdown/Reboot:

• shutdown: Shutdown the system.
• reboot: Reboot the system

Group Create :

• groupadd :Replace group_name with your desired group name. For instance, to create a group named mygroup, execute:
• sudo groupadd mygroup: This command will create a new group named mygroup. You'll need administrative privileges (via sudo) to create a group on most systems.

Soft Link (Symbolic Link) Creation:

ln -s: /path/to/original_file /path/to/link_name

Hard Link Creation:

ln : /path/to/original_file /path/to/hard_link

Exit