How do I remember all these Linux commands?

You don't need to memorize all 50 commands at once. Focus on the navigation commands first (ls, cd, pwd), then file management (cp, mv, rm, mkdir). Use these daily for a week and they'll become second nature. For the rest, bookmark this page as a cheat sheet.

What does the -r flag mean in Linux commands?

The -r flag (or --recursive) tells a command to apply recursively — meaning it processes all files and subdirectories inside a directory. For example, 'cp -r folder/ backup/' copies the entire folder including all its contents. 'rm -r folder/' deletes a folder and everything in it.

How do I run multiple commands at once?

Use && to run commands in sequence (second only runs if first succeeds): 'apt update && apt upgrade'. Use ; to run commands regardless of success: 'mkdir test; cd test'. Use | (pipe) to pass the output of one command to another: 'ls | grep .txt'.

What is the difference between rm and rm -rf?

Plain 'rm' only deletes individual files and will refuse to delete directories. 'rm -r' deletes directories recursively. 'rm -rf' adds -f (force) which skips confirmation prompts. Be very careful with 'rm -rf' — it permanently deletes everything without asking and has no undo.

How do I search for text inside files from the terminal?

Use grep: 'grep 'search term' filename.txt' to search in a specific file, or 'grep -r 'search term' /path/' to search recursively in a directory. Add -i for case-insensitive search: 'grep -i 'linux' documents/'. The results show the filename and matching line.

50 Essential Linux Commands Every Beginner Must Know (2026)

Your essential Linux command cheat sheet: 50 commands with clear explanations and examples, organized by category for easy reference.

This is your essential reference for Linux terminal commands. Fifty commands, organized by category, each with a brief explanation and a practical example. Bookmark this page and come back whenever you need a reminder.

If you are completely new to the terminal, start with our introduction to the Linux terminal first, then return here for a broader reference.

These five commands are the foundation — you will use them every single time you open a terminal.

1. pwd — Show current directory

pwd
# Output: /home/alice/Documents

2. ls — List directory contents

ls                  # basic listing
ls -l               # detailed listing with sizes and dates
ls -la              # include hidden files
ls -lh              # human-readable file sizes (KB, MB, GB)
ls /etc             # list a specific directory

3. cd — Change directory

cd Documents        # go into Documents folder
cd ..               # go up one level
cd ../..            # go up two levels
cd ~                # go to your home directory
cd /var/log         # go to an absolute path
cd -                # go back to the previous directory

4. tree — Display directory structure

tree                # show tree of current directory
tree -L 2           # limit depth to 2 levels

5. find — Search for files

find . -name "*.txt"           # find all .txt files in current directory
find /home -name "report*"     # find files starting with "report"
find . -type d                 # find directories only
find . -mtime -7               # files modified in the last 7 days

File and directory management

6. mkdir — Create a directory

mkdir projects
mkdir -p projects/web/css    # create nested directories at once

7. touch — Create an empty file or update timestamp

touch notes.txt
touch file1.txt file2.txt file3.txt   # create multiple files

8. cp — Copy files or directories

cp file.txt backup.txt              # copy a file
cp file.txt /home/alice/Documents/  # copy to another directory
cp -r myfolder/ backup-folder/      # copy a directory recursively

9. mv — Move or rename files

mv oldname.txt newname.txt          # rename a file
mv file.txt /tmp/                   # move file to /tmp
mv folder/ /home/alice/backup/      # move a directory

10. rm — Remove files or directories

rm file.txt              # delete a file
rm -i file.txt           # ask for confirmation before deleting
rm -r folder/            # delete a directory and its contents
rm -rf folder/           # force delete without confirmation (use with care)

11. ln — Create links

ln -s /path/to/file shortcut        # create a symbolic link

12. du — Show disk usage of files and directories

du -sh Documents/      # total size of Documents folder
du -sh *               # size of all items in current directory

13. df — Show disk space usage

df -h                  # disk usage of all mounted filesystems

File viewing and editing

14. cat — Display file contents

cat file.txt
cat file1.txt file2.txt    # display multiple files

15. less — View large files one page at a time

less /var/log/syslog

Inside less: use arrow keys to scroll, q to quit, / to search.

16. head — Show the first lines of a file

head file.txt           # first 10 lines (default)
head -n 20 file.txt     # first 20 lines

17. tail — Show the last lines of a file

tail file.txt           # last 10 lines
tail -n 50 file.txt     # last 50 lines
tail -f /var/log/syslog # follow the file in real time (great for logs)

18. nano — Simple text editor in the terminal

nano file.txt

Ctrl+O saves, Ctrl+X exits.

19. wc — Count lines, words, characters

wc file.txt            # lines, words, characters
wc -l file.txt         # count lines only

20. diff — Compare two files

diff file1.txt file2.txt

System information

21. uname — Show system information

uname -a               # full system information
uname -r               # kernel version only

22. hostname — Show or set system hostname

hostname               # show hostname
hostname -I            # show local IP address

23. uptime — Show how long the system has been running

uptime

24. whoami — Show the current user

whoami

25. date — Show or set the system date and time

date
date "+%Y-%m-%d"       # formatted output: 2026-02-05

26. free — Show memory usage

free -h                # human-readable memory usage (RAM and swap)

27. lscpu — Show CPU information

lscpu

Process management

28. ps — Show running processes

ps aux                 # all processes with details
ps aux | grep firefox  # find a specific process

29. top — Real-time process monitor

top

Press q to exit, k to kill a process by PID.

30. htop — Better interactive process monitor (install separately)

sudo apt install htop
htop

31. kill — Send a signal to a process

kill 1234              # gracefully stop process with PID 1234
kill -9 1234           # force kill (last resort)

32. killall — Kill all processes with a given name

killall firefox

33. bg and fg — Background and foreground jobs

command &              # run a command in the background
bg                     # send current job to background
fg                     # bring background job to foreground

User management

34. sudo — Run a command as administrator

sudo apt update
sudo nano /etc/hosts

35. su — Switch user

su alice               # switch to user alice

36. adduser — Add a new user

sudo adduser bob

37. passwd — Change a user’s password

passwd                 # change your own password
sudo passwd bob        # change another user's password

38. groups — Show group memberships

groups                 # your groups
groups alice           # alice's groups

Network commands

39. ping — Test connectivity to a host

ping google.com        # continuous ping (Ctrl+C to stop)
ping -c 4 google.com   # send exactly 4 packets

40. curl — Transfer data from URLs

curl https://example.com               # download a page
curl -I https://example.com            # show HTTP headers only
curl -o file.zip https://example.com/file.zip   # download to a file

41. wget — Download files from the internet

wget https://example.com/file.zip
wget -q https://example.com/file.zip   # quiet mode

42. ip — Show and configure network interfaces

ip addr show           # all interfaces and IP addresses
ip route show          # routing table

43. ss — Show network connections and sockets

ss -tuln               # listening TCP and UDP ports

44. ssh — Connect to a remote server

ssh user@192.168.1.100
ssh -p 2222 user@server.com    # use custom port

Package management

45. apt — Package manager for Ubuntu/Debian

sudo apt update                    # update package list
sudo apt upgrade                   # upgrade all packages
sudo apt install vlc               # install a package
sudo apt remove vlc                # remove a package
sudo apt search music              # search for packages
apt list --installed               # list installed packages

46. dpkg — Low-level package tool (Debian/Ubuntu)

sudo dpkg -i package.deb           # install a .deb file
dpkg -l                            # list installed packages

File permissions

47. chmod — Change file permissions

chmod 755 script.sh        # owner: rwx, group: r-x, others: r-x
chmod +x script.sh         # make a file executable
chmod -R 644 folder/       # change permissions recursively

48. chown — Change file ownership

sudo chown alice file.txt            # change owner
sudo chown alice:developers file.txt # change owner and group
sudo chown -R www-data /var/www/     # change ownership recursively

Text processing

49. grep — Search for text patterns

grep "error" logfile.txt              # find lines containing "error"
grep -i "linux" file.txt              # case-insensitive search
grep -r "TODO" /home/alice/projects/  # search recursively in directory
grep -n "error" logfile.txt           # show line numbers
grep -v "debug" logfile.txt           # show lines NOT matching

50. sort, uniq, cut — Text manipulation tools

sort names.txt                  # sort lines alphabetically
sort -r names.txt               # reverse sort
sort -n numbers.txt             # sort numerically
sort names.txt | uniq           # remove duplicate lines
cat file.txt | cut -d',' -f1    # extract the first column (comma-separated)

Tips to learn faster

Learning fifty commands takes time, but there are ways to make it stick.

Use them every day: Open a terminal and navigate your file system using cd and ls instead of the graphical file manager. Do this for a week and these commands become automatic.

Build on what you know: Start with navigation (commands 1-5). Once those feel natural, add file management (6-13). Progress through the categories at your own pace.

Use the history: Press the Up arrow to recall previous commands. Linux keeps a history of your last 1000 or more commands. Use history to see them and !123 to run command number 123 again.

Tab completion: Press Tab to auto-complete file names and directory paths. Type cd Doc and press Tab — it completes to cd Documents. This prevents typos and saves time.

Combine commands with pipes: The pipe character | sends the output of one command into another. ls -la | grep .txt lists all files then filters only the ones containing “.txt”. This is how simple commands become powerful tools.

Read the manual: When you want to know more about a command, run man commandname. All fifty commands above have manual pages with detailed documentation.

For the next step, read about understanding the Linux file system to understand where files live and why, and Linux file permissions explained to master the permissions system you control with chmod and chown.

50 Essential Linux Commands for Beginners — With Examples

Navigation commands