The export built-in marks variables for export to child processes.
Syntax
-
export [-prX] [name[=value]…]
Description
The export built-in is equivalent to the typeset built-in
with the -gx option.
Notes
The export built-in is a special built-in.
The POSIX standard defines the -p option only;
other options cannot be used in the POSIXly-correct mode.
The POSIX does not allow using the option together with operands.