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export DOCKERMAIL_OPENDKIM_PORT_8891_TCP_ADDR=172.17.0.10
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# re=^.*PORT_8891_TCP_ADDR=(.*)$
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# echo "$( printenv | sed 's||1|' )"
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#
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if [[ $(printenv) =~ ^.*PORT_8891_TCP_ADDR=([0-9\.]*) ]] ; then
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echo "${BASH_REMATCH[1]}"
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echo "====================="
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fi
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