This parameter lets you execute external commands - that is, executable programs or scripts - directly after the database was restarted for an offline backup with BRBACKUP:
post_shut_cmd = "<post_shut_cmd>"
BRBACKUP only accepts that the external commands have been successfully executed when:
Exit code 0 is returned
No messages are returned or only messages starting with #INFO
You can use this parameter and pre_shut_cmd when performing offline backups in a cluster environment to deactivate and later reactivate the cluster resources on the database instance.