wait-for-it

script that will wait on the availability of a host and TCP port
  https://github.com/vishnubob/wait-for-it
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Wait-for-it is a pure bash script that will wait on the availability of a host and TCP port. It is useful for synchronizing the spin-up of interdependent services, such as linked docker containers. Since it is a pure bash script, it does not have any external dependencies.