SSH
Usage: ssh user@server
Function: Connects to a Linux machine remotely.
LS
Usage: ls, ls -l, ls -a
Function: Lists files in the current directory, with options for detailed view and hidden files.
PWD
Usage: pwd
Function: Prints the current working directory.
CD
Usage: cd path, cd .., cd
Function: Changes the current directory to the specified path.
Touch
Usage: touch filename
Function: Creates a new file or updates the timestamp of an existing file.
Echo
Usage: echo 'text' > file
Function: Displays text or redirects it to a file.
Nano
Usage: nano filename
Function: Opens a file in the Nano text editor.
Vim
Usage: vim filename
Function: Opens a file in the Vim text editor.
Cat
Usage: cat filename
Function: Concatenates and displays the content of files.
Shred
Usage: shred filename
Function: Overwrites a file to hide its contents, and optionally deletes it.
MKDIR
Usage: mkdir directoryname
Function: Creates a new directory.
CP
Usage: cp file destination
Function: Copies files and directories.
MV
Usage: mv file destination
Function: Moves or renames files and directories.
RM
Usage: rm file, rm -r directory
Function: Removes files or directories.
LN
Usage: ln -s file link
Function: Creates a symbolic link to a file.
Clear
Usage: clear
Function: Clears the terminal screen.
Whoami
Usage: whoami
Function: Displays the current user’s username.
Adduser
Usage: sudo adduser username
Function: Adds a new user to the system.
Sudo
Usage: sudo command
Function: Executes a command with superuser privileges.
SU
Usage: su username
Function: Switches the current user to another user.
Exit
Usage: exit
Function: Exits the current session or shell.
Passwd
Usage: passwd username
Function: Changes the password for a user.
APT
Usage: sudo apt update, sudo apt install package
Function: Handles package installation and updates on Debian-based systems.
Finger
Usage: finger username
Function: Displays information about a user.
Man
Usage: man command
Function: Displays the manual page for a command.
Whatis
Usage: whatis command
Function: Displays a one-line description of a command.
Which
Usage: which command
Function: Shows the path to the command’s executable.
Wget
Usage: wget URL
Function: Downloads files from the internet.
Curl
Usage: curl URL > file
Function: Transfers data from or to a server.
Zip
Usage: zip file.zip file
Function: Compresses files into a zip archive.
Unzip
Usage: unzip file.zip
Function: Extracts files from a zip archive.
Less
Usage: less filename
Function: Views the content of a file one page at a time.
Head
Usage: head filename
Function: Displays the first few lines of a file.
Tail
Usage: tail filename
Function: Displays the last few lines of a file.
CMP
Usage: cmp file1 file2
Function: Compares two files byte by byte.
Diff
Usage: diff file1 file2
Function: Displays the differences between two files.
Sort
Usage: sort filename
Function: Sorts the lines of a file.
Find
Usage: find directory -name filename
Function: Searches for files in a directory hierarchy.
CHMOD
Usage: chmod +x filename
Function: Changes the file mode (permissions).
CHOWN
Usage: chown user filename
Function: Changes the owner of a file.
Ifconfig
Usage: ifconfig
Function: Configures network interfaces.
IP
Usage: ip address
Function: Shows and manipulates routing, devices, policy routing, and tunnels.
Grep
Usage: grep pattern file
Function: Searches for patterns in files.
Awk
Usage: awk pattern file
Function: A versatile programming language for working on files.
Resolveconf
Usage: resolveconf status
Function: Manages the system’s DNS resolver configuration.
Ping
Usage: ping hostname
Function: Checks the reachability of a host on an IP network.
Traceroute
Usage: traceroute hostname
Function: Traces the route packets take to a network host.
Netstat
Usage: netstat, netstat -tulpen
Function: Displays network connections, routing tables, interface statistics, masquerade connections, and multicast memberships.
SS
Usage: ss -tulpen
Function: Another utility to investigate sockets.
UFW
Usage: ufw allow port, ufw status, ufw enable
Function: Uncomplicated Firewall, a frontend for managing firewall rules.
Uname
Usage: uname, uname -a
Function: Prints system information.
Neofetch
Usage: neofetch
Function: Shows system information with an image.
Cal
Usage: cal
Function: Displays a calendar.
Bc
Usage: echo "scale=2; 10/3" | bc
Function: An arbitrary precision calculator language.
Free
Usage: free
Function: Displays the amount of free and used memory in the system.
DF
Usage: df -h
Function: Reports file system disk space usage.
PS
Usage: ps aux
Function: Reports a snapshot of the current processes.
Top
Usage: top
Function: Displays Linux processes.
Shred
Usage: shred filename
Function: Overwrites a file to hide its contents, and optionally deletes it.
Tar
Usage: tar -czf archive.tar.gz directory
Function: Compresses files or directories into a tarball (.tar.gz).
Find
Usage: find /path/to/search -name "filename"
Function: Searches for files or directories matching a pattern.
Touch
Usage: touch filename
Function: Creates an empty file or updates the timestamp of an existing file.
History
Usage: history
Function: Displays the history of previously executed commands.
Alias
Usage: alias name="command"
Function: Creates a shortcut for a longer command.
Chmod
Usage: chmod 755 filename
Function: Changes the permissions of a file or directory.
Truncate
Usage: truncate -s 0 filename
Function: Reduces the size of a file to zero without deleting it.
Export
Usage: export VAR=value
Function: Sets environment variables for the current session or for subprocesses.
Wc
Usage: wc filename
Function: Counts the number of lines, words, and bytes in a file.
Stty
Usage: stty -echo
Function: Changes and prints terminal line settings, like disabling input echo.
Sleep
Usage: sleep 5
Function: Pauses execution for the specified amount of time (in seconds).
Uptime
Usage: uptime
Function: Displays the system uptime (how long the system has been running).
Last
Usage: last
Function: Shows the last logged-in users and their login times.
Systemctl
Usage: systemctl status
Function: Used to examine and control systemd services (system services).
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