Awk

cat ~/12 | awk '{print "/data/prod/"$1}'

echo "list_snapshots" | hbase shell | egrep "\([A-Za-z]{3} [A-Za-z]{3} [0-9]{2} [0-9]{2}:[0-9]{2}:[0-9]{2} \+[0-9]{4} [0-9]{4}\)" | grep $(date +%b) | awk -F ' ' '{printf ("delete_snapshot '\''%s'\''\n", $1)}' | hbase shell

cat 1  | grep -v main | grep "\[.*\]" | egrep -o "\"[^,|^\"]*\"" | tr -d '"' | awk -v date=$dateString '{printf("snapshot '\''%s'\'', '\''%s-snapshot-%s'\''\n", $1, $1, date)}'