Introduction to bash
Advanced bash
Bash by Example, part 1
Bash by Example, part 2
GNU bash
GNU bash reference manual
Show the parent executing this script
Show 50 random numbers
List the largest "n" files in the current directory
Syntax for bash loops that count to 5
Show file properties
Demonstrate file globbing
Show which file has more lines
Demonstrate functions, loops, and file input
Show return values from a function
Show the difference between returned value and it local copy