I'm very new at db2 i'd like to grant reorg privilege to an user i tried with the following command
db2 => grant reorg on database DB_NAME to USR_NAME;

but it shows following error.

DB21034E The command was processed as an SQL statement because it was not a
valid Command Line Processor command. During SQL processing it returned:
SQL0104N An unexpected token "reorg" was found following "grant ". Expected
tokens may include: "READ". SQLSTATE=42601

can anyone please help me on this?

You can see the required authorization for a command in Chapter 5. CLP commands in "DB2 for LUW Command Reference".