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I want to delay the script execution until a certain server process is ready, which it is once it accepts incoming TCP connections.

How do I test if a local TCP port is open (I get a SYN/ACK answer)?

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See: unix.stackexchange.com/a/191658/38906 –  cuonglm Mar 22 at 9:56

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I would use lsof if available for this purpose. You can grep the output to check for a line of output with a LISTEN condition for the port in question. Some options may have to be passed to prevent converting port names to symbolic, etc, see man lsof for details.

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