How to import only users over a network link

Use the following parameter file to import only the user definitions from your source database to your test database:
Remember that the database link proddb01 must be correctly defined and working before you import the data.

userid='system/yourpassword
network_link=proddb1.mydomain.com
logfile=DATA_PUMP_DIR:user_definitions.log
full=Y
include=USER

To import a specific user only:

INCLUDE=USER:"='SCOTT'"

To include a specific user and remap it to another user name during import:

REMAP_SCHEMA=SCOTT:JIM
INCLUDE=USER:"='SCOTT'"

Remember to check if the SCOTT user is assigned a default tablespace that doesn't exist in the target database.
If this is the case, you need to use remap_schema directive to make it work:

REMAP_TABLESPACE=SCOTT_DATA:JIM_DATA

... or potentiall pre-create the tablespace SCOTT_DATA in the target database, but this may not be what you wish.