Find all files in the current directory with a ".txt" extension, execute the awk command to print the first field of each file, sort the output, count the number of occurrences of each unique value, and sort the output by the number of occurrences in descending order.
find . -maxdepth 1 -type f -name "*.txt" -exec awk '{print$1}' {} + | sort | uniq -c | sort -rn