Set an environment variable. Mark each name to be passed to child processes in the environment.
export [-fn] [-p] [name[=value]]
-f The names refer to shell functions; otherwise the names refer to shell variables -n No longer mark each name for export. -p Display output in a form that can be reused as input.
If no names are supplied, or if the `-p’ option is given, a list of exported names is displayed.
The return status is zero unless an invalid option is supplied, one of the names is not a valid shell variable name, or `-f’ is supplied with a name that is not a shell function.
export is a bash built in command.
Example – local variables
mv $old_file $new_file
Example – global variables
mydepartment=Sales ; export mydepartment
mycustomer=’Brown Brothers’ ; export mycustomer