08-30-2018
I moved the thread to "UNIX for Beginners Questions & Answers" - and closed it. Please comply to the
forum rules that you accepted when you registered: post homework / classwork in the
home- and coursework forum respecting the
home- and coursework rules.
Nevertheless, a few comments to your post:
- A shell (and every other) variable has a value / contents that does not change depending on how it is used / evaluated. So $USER will show the same, be it echoed or printfed.
- Urgent ("really need help") posts are deprected in here and don't get increased attention nor are they preferredly answered.
- Heed what other, longer term members (here: bakunin) are suggesting on how to prepare a post so people ready to answer don't need to guess about what be the real problem.
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LEARN ABOUT CENTOS
drop_user_mapping
DROP USER
MAPPING(7) PostgreSQL 9.2.7 Documentation DROP USER MAPPING(7)
NAME
DROP_USER_MAPPING - remove a user mapping for a foreign server
SYNOPSIS
DROP USER MAPPING [ IF EXISTS ] FOR { user_name | USER | CURRENT_USER | PUBLIC } SERVER server_name
DESCRIPTION
DROP USER MAPPING removes an existing user mapping from foreign server.
The owner of a foreign server can drop user mappings for that server for any user. Also, a user can drop a user mapping for his own user
name if USAGE privilege on the server has been granted to the user.
PARAMETERS
IF EXISTS
Do not throw an error if the user mapping does not exist. A notice is issued in this case.
user_name
User name of the mapping. CURRENT_USER and USER match the name of the current user. PUBLIC is used to match all present and future
user names in the system.
server_name
Server name of the user mapping.
EXAMPLES
Drop a user mapping bob, server foo if it exists:
DROP USER MAPPING IF EXISTS FOR bob SERVER foo;
COMPATIBILITY
DROP USER MAPPING conforms to ISO/IEC 9075-9 (SQL/MED). The IF EXISTS clause is a PostgreSQL extension.
SEE ALSO
CREATE USER MAPPING (CREATE_USER_MAPPING(7)), ALTER USER MAPPING (ALTER_USER_MAPPING(7))
PostgreSQL 9.2.7 2014-02-17 DROP USER MAPPING(7)