lscpu: See CPU information.

lsblk: See information about block devices.

lspci -tv: Show PCI devices in a tree-like diagram.

lsusb -tv: Display USB devices in a tree-like diagram.

lshw: List hardware configuration information.

cat /proc/cpuinfo: Show detailed CPU information.

cat /proc/meminfo: View detailed system memory information.

free -h: Display free and used memory.

hdparm -i /dev/sda: Display disk data information.

badblocks -s /dev/sda: Test for unreadable blocks on the device/disk.

fsck /dev/sda: Run a disk check on an unmounted disk or partition.

find / -name example.txt: Find files and directories that match the specified pattern in a specified location.

grep 'hello' filename.txt: Search for a specific pattern in a file with grep.

locate updatedb: Locate all files and directories related to a particular name.

awk '/pattern/ { print $0 }' filename: Print all lines matching a pattern in a file.

sed 's/original/replacement/' filename: Find and replace text in a specified file.

pwd: Show the directory you are currently working in.

cd /path/to/folder: Change directory to specified path.

cd ..: Move up one directory level.

cd -: Change to the previous directory.

dirs: Show current directory stack.

chmod 777 /path/to/file: Assign full permission to everyone.

chmod 755 /path/to/file: Assign standard file permissions.

chown user:group /path/to/file: Change file ownership.

chgrp group /path/to/file: Change file group.

apt install package_name: Install APT package.

yum install package_name: Install YUM package.

dpkg -i package.deb: Install .deb package.

rpm -i package.rpm: Install .rpm package.

snap install package_name: Install Snap package.

ps: List active processes.

pstree: Show processes in tree diagram.

top: See all running processes.

kill: Terminate a process.

bg: Resume stopped process in background.

fg: Bring process to foreground.

uname -a: See kernel information.

uptime: Display system uptime.

hostname: View system hostname.

date: See current date.

whoami: See current user.

finger: Show user information.

ip address show: List IP addresses.

ping: Ping remote host.

netstat -an: Show active ports.

dig: Show DNS information.

nslookup: Receive domain name information.

id: See user identity.

whoami: See current user.

useradd: Create new user.

groupadd: Create new group.

passwd: Change password.

ssh: Connect to host securely.

ssh-keygen: Generate SSH keys.

scp: Securely copy files.

sftp: Secure file transfer.

tar cf archive.tar folder: Archive files.

tar xf archive.tar: Extract archived files.

gzip file: Compress/decompress .gz files.

bzip2 file: Compress/decompress .bz2 files.

Ctrl + C: Kill process.

Ctrl + Z: Stop process.

Ctrl + Y: Paste clipboard contents.

Ctrl + R: Recall last command.

clear: Clear terminal screen.

man command: Show manual for command.