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That is an "abbreviated if construct" in recent bash (and other recent shells). If the result of the [[ ... ]] compound command is true, the && command is executed, if false, the || command.
cf....

With a recent bash, try[[ "$(tail -${LEFT_OVR} color.txt | tr '\n' ' ' )" =~ "$color" ]] && echo good || echo bad

With LEFT_OVR=4, trytail -${LEFT_OVR} color.txt | { while read CND; do CMD+="[ color = $CND ] || "; done; echo ${CMD% || }; }
[ color = Yellow ] || [ color = White ] || [ color = Pink ] || [ color =...