echo "duplicates in models.txt:" MODELS=$(cat models.txt | awk -F ',' '{ print($1) }' | sort) echo "$MODELS" | uniq -d echo "duplicates in series.txt:" SERIES_MODELS=$(cat series.txt | awk '{ n=split($0,a,","); for(i=3;i<=n;i++) if(length(a[i]) != 0) print(a[i]); }' | sort) echo "$SERIES_MODELS" | uniq -d echo "diff between models.txt and series.txt:" diff <(echo "$MODELS") <(echo "$SERIES_MODELS")