odps-inst:tldr:cc442

The command "wait ${instance_id};" is a shell command used to wait for a specific process or task to complete before continuing with the rest of the script.

In this specific command, "${instance_id}" is a placeholder representing the ID of an instance or process that you want to wait on. It could be the identifier of a running process, a PID (Process ID), or the ID of an instance in a cloud environment.

By including the "wait" command followed by the instance ID, the script execution will pause until that particular process or instance is no longer running. Once the process or instance is completed or terminated, the script will resume its execution.

The purpose of using this command may be to synchronize the execution of multiple processes or to ensure that a specific task is completed before proceeding with the rest of the script.