ls - List directory contents
```
 ls [options] [file/directory]
```
cd - Change directory
```
 cd [directory]
```
pwd - Print working directory
```
 pwd
```
mkdir - Make directory
```
 mkdir [directory]
```
rm - Remove files or directories
```
 rm [options] [file/directory]
```
cp - Copy files or directories
```
 cp [options] source destination
```
mv - Move or rename files or directories
```
 mv [options] source destination
```
cat - Concatenate and display files
```
 cat [options] [file]
```
more - Display output one screen at a time
```
 more [file]
```
less - Display output one screen at a time, backward as well
```
less [file]
```
head - Output the beginning of a file
```
head [options] [file]
```
tail - Output the end of a file
```
tail [options] [file]
```
grep - Search for patterns in files
```
grep [options] pattern [file]
```
chmod - Change file permissions
```
chmod [options] mode file
```
chown - Change file ownership
```
chown [options] user:group file
```
find - Search for files in a directory hierarchy
```
find [path] [options] [expression]
```

tar - Manipulate archives

tar [options] [archive-file] [files...]

df - Report filesystem disk space usage
```
df [options]
```
du - Estimate file space usage
```
du [options] [file/directory]
```
ps - Report process status
```
ps [options]
```
top - Display Linux processes
```
top
```
free - Display amount of free and used memory in the system
```
free [options]
```
hostname - Show or set the system's host name
```
hostname [options]
```
ifconfig - Configure network interface parameters
```
ifconfig [interface] [options]
```
ping - Send ICMP ECHO_REQUEST to network hosts
```
ping [options] host
```
wget - Retrieve files from the web
```
wget [options] [URL]
```
ssh - OpenSSH SSH client
```
ssh [user@]hostname [command]
```

scp - Secure copy (remote file copy program)

scp [options] [user@]from-host:source-file [user@]to-host:destination-file

man - Display manual pages
```
man [command]
```
info - Display program information
```
info [command]
```
passwd - Change user password
```
passwd [username]
```
su - Substitute user identity
```
su [options] [username]
```
sudo - Execute a command as another user
```
sudo [options] command
```
date - Print or set the system date and time
```
date [options]
```
cal - Display a calendar
```
cal [options]
```
uptime - Show how long the system has been running
```
uptime
```
who - Show who is logged on
```
who [options]
```
w - Show who is logged on and what they are doing
```
w [options]
```
last - Show a listing of last logged in users
```
last [options]
```
history - Display the history list with line numbers
```
history [options]
```
chmod - Change the mode of a file (permissions)
```
chmod [options] mode file
```
chown - Change file owner and group
```
chown [options] owner[:group] file
```
uptime - Show how long the system has been running
```
uptime
```
wc - Print newline, word, and byte counts for each file
```
wc [options] [file]
```
echo - Display a line of text
```
echo [options] [string]
```
kill - Terminate processes
```
kill [options] pid
```

These commands should cover a wide range of basic Linux tasks and are essential for any Linux user or administrator.

Mastering Linux Commands: A Comprehensive Cheat Sheet for Every User