IMPORTANT

This relies on a bash shell, without this you cannot utilise this utility. If you are using alpine container builds then add bash

apk add bash

WHY bash?

Well we could netcat, but then we're stuck in sh shell hell where we have to use dynamic variable names for arrays.

Usage

wait-for-it.sh host:port [host:port] [-t timeout] [-- command args]
-t TIMEOUT                  Timeout in seconds, zero for no timeout
-- COMMAND ARGS             Execute command with args after the test finishes

Example

./wait-for-it.sh www.google.com:80 www.yahoo.com:80 -t 5 -- echo "hello world"
Connection to www.google.com port 80 [tcp/http] succeeded!
Connection to www.yahoo.com port 80 [tcp/http] succeeded!
hello world