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awk ' BEGIN {OFS="\t\t";while(getline < "file2"){m[$1]=$2;n[$1]=$3}}{m[$1]+=$2;n[$1]+=$3}{print $1,m[$1],n[$1]}' file1
or using sort at the end
awk 'BEGIN{OFS="\t\t"}END{for(i in a) print...