Shell Scripting concepts covered in this lesson:

• Positional parameters. ($0, $1, $2, $3, etc.)

• The difference between arguments and parameters.

• The which command.

• The command search path and the PATH shell variable.

• The hash shell builtin.

• The basename and dirname commands.

• Using command substitution within another command without assigning it to a variable first.

• The for loop.

• Special parameters including $#, $@, and $*.