Unique values from specific column in set of files

Possibly handy piping of commands…

cut -d" " -f7 D*.txt|sort|uniq>gates.txt

This:

1. takes all files matching “D*.txt”
2. cut -d” ” -f7   gets the 7th column, using the space character as a delimiter
3. sorts the values ascending
4. gets all unique values
5. pipes into output file gates.txt