Please read below:
The usage format is:
pgp --import <input> [<input2> ...] [options]
Where:
<input> is the filename of the key being imported. Multiple keys can also be
imported by listing them, separated by a space.
[options] modify the behavior of the command. Options are:
--import-format specifies the import format for the current operation. See --
import-format for more information.
--manual-import-keys changes the behavior of PGP Command Line when keys
are found during import operations. The default is all.
--manual-import-key-pairs changes the behavior of PGP
Please read guide for more information:
http://www.symantec.com/business/support/resources/sites/BUSINESS/content/live/DOCUMENTATION/4000/DOC4570/en_US/pgpCmdline_1020_usersguide_en.pdf