Quick reference until or unless mcrcon adds support for this behavior automatically

MCRCON_PASS="$(sed -n -e 's/^rcon\.password=\(.\+\)/\1/p' < server.properties)" mcrcon

Alternatively, a bash alias:

alias mcrcon='env MCRCON_PASS="${MCRCON_PASS:=$(sed -n -e '\''s/^rcon\.password=\(.\+\)/\1/p'\'' < server.properties)}" mcrcon'
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