Lists all the instances that are created using the db2icrt command from the same DB2® copy location that you are running the db2ilist command.
On Linux and UNIX operating systems, this utility is located in the DB2DIR/instance directory, where DB2DIR is the instance directory where the DB2 copy is installed. On Windows operating systems, this utility is located under the DB2PATH\bin directory where DB2PATH represents the installation location where the current version of the DB2 database system is installed.
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On AIX® 6.1 (or higher), when running this command from a shared DB2 copy in a system workload partition (WPAR) global environment, this command must be run as the root user.