Linux Cheetsheet.md

Basic Linux Command Reference Cheat Sheet

Command	Description
man <tool>	Opens the manual page for the specified tool.
<tool> -h	Displays the help page of the tool.
apropos <keyword>	Searches man pages for a given keyword.
cat	Concatenates and prints file contents.
whoami	Displays the current logged-in username.
id	Returns the user ID (UID) and group ID (GID).
hostname	Shows or sets the system's hostname.
uname	Prints system information (use -a for all details).
pwd	Prints the current working directory.

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🌐 Network & System Info

Command	Description
ifconfig	Displays or configures network interfaces (deprecated).
ip	Manages IP addresses, routes, interfaces, and tunnels.
netstat	Displays network connections and routing tables.
ss	Modern replacement for netstat, shows socket statistics.
ps	Displays currently running processes.
who	Shows who is currently logged in.
env	Prints the environment variables.
lsblk	Lists block devices.
lsusb	Lists USB devices.
lsof	Lists open files.
lspci	Lists PCI devices.

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👤 User & Group Management

Command	Description
sudo	Runs a command as another user (usually root).
su	Switches to another user account.
useradd	Creates a new user.
userdel	Deletes a user account and associated files.
usermod	Modifies a user account.
addgroup	Adds a group to the system.
delgroup	Deletes a group from the system.
passwd	Changes user password.

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📦 Package Management

Command	Description
dpkg	Installs, removes, and manages .deb packages.
apt	High-level package manager for Debian-based systems.
aptitude	Alternative to apt, with a text UI.
snap	Installs and manages Snap packages.
gem	Ruby package manager.
pip	Python package manager.

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🛠 System Services & Processes

Command	Description
systemctl	Controls systemd services.
ps	Lists running processes.
journalctl	Views logs from systemd journal.
kill	Sends signals to processes (like kill -9 <PID>).
bg	Resumes a suspended job in the background.
jobs	Lists background jobs.
fg	Brings a job to the foreground.

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🌍 Networking Tools

Command	Description
curl	Transfers data to/from a server (supports many protocols).
wget	Retrieves files using HTTP, HTTPS, or FTP.
python3 -m http.server	Starts a quick web server on port 8000.

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📁 File & Directory Management

Command	Description
ls	Lists directory contents.
cd	Changes directory.
clear	Clears the terminal.
touch	Creates an empty file.
mkdir	Creates a new directory.
tree	Displays directories in tree format.
mv	Moves or renames files or directories.
cp	Copies files or directories.
nano	Command-line text editor.
which	Shows the path of a command.

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🔍 File Searching & Viewing

Command	Description
find	Searches files in a directory hierarchy.
updatedb	Updates the file index used by locate.
locate	Finds files quickly using a prebuilt index.
more	Views output one screen at a time.
less	Like more, but with more features.
head	Shows the first 10 lines of a file.
tail	Shows the last 10 lines of a file.

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🧹 Text Processing

Command	Description
sort	Sorts lines in text files.
grep	Searches for patterns in files or input.
cut	Removes sections from each line.
tr	Translates or deletes characters.
column	Formats output into columns.
awk	Pattern scanning and text processing tool.
sed	Stream editor for filtering and transforming text.
wc	Counts lines, words, and characters in a file.
chmod	Changes file permissions.
chown	Changes file owner and group.

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