The Export section provides the method for regenerating a source file from LDAP directory entries. This section is optional. When it exists, it must contain the keyword LINE. The LINE keyword in the Export section must reflect the format of a line in the original source file.
The Export section contains the following subsections:
Condense: this optional subsection contains variable definitions that can be used in the Build subsection to build the parameters required to generate LINE.
Build: Contains at least the output LINE definition.
In the nis.mapping file, the Build subsection defines the rules for constructing an NIS key/NIS value pair; it also defines the rules for generating the line in the NIS file corresponding to the LDAP directory entry.