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...