cat - Concatenate and display file content

cd - Change directory

chmod - Modifies the permissions of a file or directory.

chown - Change file owner and group.

cp - Copies files or directories from one location to another.

curl or wget - Download files from the internet.

env - Prints environment or sets and executes command.

find - Search for files in a directory hierarchy. Searches for files and directories based on various criteria.

grep - Search for a pattern in files.

hostname - Sets or prints the name of current host system.

id - Returns users identity

ifconfig - The ifconfig utility is used to assign or to view an address to a network interface and/or configure network interface parameters.

ip - Ip is a utility to show or manipulate routing, network devices, interfaces and tunnels.

kill - Terminate a process. Sends a signal to a process, usually to terminate it.

ls - Lists files and directories in the current directory.

lsblk - Lists block devices.

lsof - Lists opened files.

lspci - Lists PCI devices.

lsusb - Lists USB devices.

mkdir - Make directory.

mv - Moves or renames files or directories.

netstat - Shows network status.

ps - Process status. Displays information about running processes.

pwd - Print working directory.

rm - Remove files or directories.

rmdir - Remove directory.

scp - Secure Copy. Copies files between hosts on a network using SSH.

ss - Another utility to investigate sockets.

ssh - Secure Shell

sudo - Execute a command with administrative privileges. Allows a permitted user to execute a command as the superuser or another user.

top or htop - Display system activity in real-time. Shows a dynamic view of system processes and resource usage.

touch - Creates an empty file or updates the access and modification times of a file.

uname - Prints basic information about the operating system name and system hardware.

who - Displays who is logged in.

whoami - Displays current username.