Linux Commands List - The Essential Commands, Explained with Examples (Try Them in Your Browser)

Here is a categorized list of the essential Linux commands, each with its syntax, role, and examples.

What makes this list different from others: every command on this page can be practiced right in your browser. Each entry has a practice link that opens the matching WebTerm Learn lesson. There is nothing to install and nothing you can break. Don't just read; when a command catches your eye, go type it.

Working with Files and Directories

The highest-frequency group, and the place to start.

The forms you will type most often:

ls -la              # detailed view, including hidden files
mkdir -p app/src    # create nested directories at once
cp -r docs backup   # copy a whole directory
mv draft.txt notes/ # move into the notes directory
rm -i old.txt       # confirm before deleting

Directories nest inside each other, and the "paths" you handle with pwd and cd are addresses into that nesting.

Viewing File Contents

Checking a file from the command line is often faster than opening an editor.

tail -n 20 access.log   # just the latest 20 log lines
less error.log          # scroll through a long log (q to quit)

Searching and Filtering

For "where is that file" and "which lines contain this string".

find . -name "*.log"          # find .log files under the current directory
grep -n "ERROR" server.log    # matching lines with line numbers
grep -r "TODO" src/           # search a directory recursively
wc -l access.log              # count lines in a log

Pipes and Redirection

The real power of the terminal is combining commands. These are symbols rather than commands, but they matter just as much.

grep "ERROR" app.log | wc -l   # count error lines
ls -la > files.txt             # save the listing to a file
echo "done" >> history.log     # append one line to a log

Compressing and Archiving

tar -czf backup.tar.gz docs/   # compress the docs directory
tar -xzf backup.tar.gz         # extract it
tar -tf backup.tar.gz          # just list the contents

Shell Tricks and Configuration

The group that makes your daily typing faster.

alias gs='git status'   # two keystrokes for a frequent command
echo $SHELL             # check which shell you are using
man ls                  # read the manual for ls (q to quit)

Permissions and Root Privileges

Unavoidable on servers. When you hit "Permission denied", come back here.

chmod +x deploy.sh        # make a script executable
sudo chown app config.yml # hand ownership to the app user

Users and Packages

sudo apt update            # refresh package information
sudo apt install tree      # install tree

Processes and System Health

When someone says "the server feels slow", these are the first commands you reach for.

ps aux | grep node   # find node processes
df -h                # disk space in human-readable units
du -h -d 1 .         # which directory is eating the space

Services and Scheduled Tasks

sudo systemctl restart nginx   # restart nginx
journalctl -u nginx            # check nginx logs
crontab -l                     # list scheduled tasks

Networking

ping example.com                        # reachability check
curl -O https://example.com/data.json   # download a file
ssh app@203.0.113.10                    # log in to a server

Turning a List into Commands You Can Actually Use

This list covers nearly everything you need for everyday work. But nobody learns commands by staring at a table. Commands are like vocabulary in a foreign language: they stick exactly as fast as you use them.

WebTerm Learn teaches every command on this page in a safe, browser-based environment where you type them for real. There is nothing to install or configure, and any mistake resets in one click.

• Terminal Introduction: your very first steps, from pwd, cd, and ls to file operations
• Terminal Fundamentals: find, grep, pipes, and the tools of daily work
• Terminal Advanced: permissions, processes, and networking, the gateway to server administration

Found a command you want in your fingers? Hit "Open lesson" in the table and type it right now.