Pass (export) the value of one or more shell
variables, giving global meaning to the variables (which are local by default). For example, a variable defined in one shell script must be exported if its value will be used in other programs called by the script. When a shell variable has been exported, you can access its value by referencing the equivalent environment variable. If no
variables are given, export lists the variables exported by the current shell. If
value are specified, export assigns
value to a variable
name and exports it.
Treat all subsequent strings as arguments, not options.
Expect variables to be functions.
List variables exported by current shell.