Apple OS X Syntax

 Arguments      Shell parameters
 Variables      Variable Substitution
 List of Environment variables
 List of Special bash shell variables
 Array Variables
 Redirection    Redirect output from one command as input for another
 OS X Filesystem hierarchy
 bash Terminal Keyboard Shortcuts
 OSX Keyboard Shortcuts

Looping constructs:
The break and continue builtins may be used to control loop execution.

   if      Conditionally perform a command
   for     Expand words, and execute commands
   while   Execute commands

 Logical, arithmetical and comparison operators
 Conditional Expressions
 Conditional execution

Working with the bash Shell:

 Run a bash shell script
 Prompt Statement variables
 Bash startup files bashrc

General OS X

 Save an OS X installer to a bootable USB drive
 Defaults - setting system preferences
 Background Processes (Westwind)
 Valid Filenames in OS X

For examples of all the above see OS X books