Used to give details about linux commands
man
List directory contents
ls
Find text in a file
grep
Print working directory
pwd
Move a file
mv
Copy a file
cp
Remove a file
rm
Change file permissions. Read, write, and execute
chmod
Changes file owner and group
chown
Executes any commands as administrator
sudo
Install, delete, or update
yum
Disk free space
df
Displays running processes
ps
Find DNS information
dig
Reads data from a file and displays content as a output
cat
Closes a process running
kill