Alias: Create an alias

apropos: Search Help manual pages (man -k)

bash: Bourne Again Shell

bzip2: Compress or decompress named file(s)

cal: Display a calendar

cat: Concatenate and print (display) the content of files

cd: Change directory

chgrp: Change group ownership

chmod: Change access permissions

chown: Change file owner and group

cp: Copy one or more files to another location

date: Display or change the date and time

df: Display free disk space

diff: Display the differences between two files

echo: Display a message on screen

env: Display environment variables

exec: Execute a command

exit: Exit the shell

export: Set an environment variable

fg: Send a job to foreground

file: Determine the file type

fsck: Check and repair the file system consistency

gawk: Find and replace text within file(s)

grep: Search file(s) for lines that match a given pattern

groupadd: Add a user security...