Linux BASH syntax

Parameters    Shell parameters
Variables     Environment variables
Arrays        Array Variables
Redirection   Spooling to and from files
Pipes         Redirect the output from one command as input for another

Looping constructs:

   IF THEN ELSE Conditional Execution
   if           Conditionally perform a command
   for          Expand words, and execute commands
   until        Execute commands (until error) 
   while        Execute commands

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

Evaluating expressions

   Using brackets to Group and expand expressions
   Conditional expressions
   Arithmetic expressions
   Escape Chars, delimiters and Quotes
   Command Substitution

Note that wherever a `;' appears in the description of a command's syntax, it may be replaced with one or more newlines.

Scripts       Writing Shell Scripts
vi editor     A one page reference to the editor commands
Job Control   Suspend and resume a process
Prompt        Prompt variable
###           Comment / Remark

For examples of all the above see my recommended Linux/UNIX books