Hidasta

A simple cross-process signalling mechanism for shell scripts.

This is not an officially supported Google product

Why?

Sometimes you need multiple shell script processes to wait for an event.

How?

To wait:

hidasta -w $socket_path, called from any number of processes, will block until signalled.

To signal:

hidasta -s $socket_path just once. All instances currently waiting on the socket path will return, and the callers can continue.

Where?

$socket_path is the path at which a new Unix Domain Socket will be created (and removed once signalled). Only works on Unix, but can use filesystem permissions to restrict who can signal or wait.