1 example for join

  # Perform a join on the columns stored in two files, like a SQL join:
$ echo -e "\na:" ; cat a ; echo -e "\nb:" ; cat b ; echo -e "\njoin:" ; join a b

a:
1 mike hix
2 grant holly
3 chicken noodle

b:
1 coconuts
2 eggs
3 soup

join:
1 mike hix coconuts
2 grant holly eggs
3 chicken noodle soup