Essential Linux Command Cheat Sheet for Beginners

Commands are the instructions you give a computer to perform tasks such as shutting down, listing files, or displaying messages. The following basic Linux commands are useful for beginners, system administrators, and anyone working in a terminal.

ls – List : Shows the contents of the current working directory, similar to opening a folder in a graphical interface.

mkdir – Make Directory : Creates a new directory. Example: mkdir new-directory-name.

pwd – Print Working Directory : Displays the absolute path of the current directory.

cd – Change Directory : Changes the current working directory. Example: cd /path/to/directory.

rmdir – Remove Directory : Deletes an empty directory. Example: rmdir directory-name.

rm – Remove : Deletes files or directories. Use rm -r directory-name for recursive removal.

cp – Copy : Copies files or directories. Example: cp source-file destination-file or cp -r source-dir destination-dir for recursive copy.

mv – Move : Moves or renames files and directories. Example: mv old-name new-name or mv file /new/path/.

cat – Concatenate and Print Files : Displays the contents of a file on the terminal.

tail – Print Last Lines : Shows the last 10 lines of a file by default; use tail -n N file to specify the number of lines.

less – View File Page by Page : Opens a file for paginated viewing; navigate with Ctrl+F (forward) and Ctrl+B (backward).

grep – Search Text : Finds a string in a file. Example: grep "text" file. Options: -i (ignore case), -r (recursive).

find – Locate Files : Searches for files matching criteria. Example: find /path -name "filename" (case‑sensitive) or -iname (case‑insensitive).

tar – Archive Utility : Creates, lists, or extracts tar archives. Examples: tar -cvf archive.tar files, tar -tvf archive.tar, tar -xvf archive.tar.

gzip – Compress/Decompress : Compresses a file ( gzip filename) or decompresses with gzip -d filename.gz.

unzip – Extract ZIP Archives : Extracts a zip file ( unzip archive.zip) and can list contents with unzip -l archive.zip.

help – Command Help : Shows a brief usage summary for any command, e.g., command --help or -h.

whatis – One‑Line Description : Provides a short description of a command, e.g., whatis ls.

man – Manual Pages : Displays the full manual for a command, e.g., man ls.

exit – End Session : Closes the current terminal session.

ping – Network Reachability : Sends ICMP packets to test connectivity to a remote host, e.g., ping example.com.

who – Logged‑In Users : Lists users currently logged into the system.

su – Switch User : Changes the active user identity, optionally without a password for the superuser.

uname – System Information : Shows kernel name, hostname, version, etc.; uname -a displays all details.

free – Memory Usage : Reports free and used memory; options -m (MB) and -g (GB) adjust units.

df – Disk Space : Shows filesystem usage; df -h presents sizes in a human‑readable format.

ps – Process Snapshot : Lists currently running processes.

top – Real‑Time Process Monitor : Displays processes sorted by CPU usage; top -u username filters by user.

shutdown – Power Off / Reboot : Turns off the machine; shutdown -r restarts it.

These commands form the foundation for everyday Linux work, enabling file manipulation, system monitoring, networking checks, and basic administration without requiring extensive scripting knowledge.