Obscure linux/unix text processing command: what is 'dt'? I'm trying to figure out what one of my boss's data analysis scripts is doing, and I'm hung up on this weird little command called dt. There aren't any man or help pages for it, and googling around hasn't come up with anything.

The script I'm looking at reads in a formatted data file ('tmp') with X numbers of columns. Each row is a consecutive point in time. The line I'm stuck on reads as follows:

cat tmp | dt t 1 t 2 t 3 d 12

The numbers specify columns, but I'm not entirely sure what the 't' and 'd' arguments are doing there. I suspect the script is sorting the data in some fashion, and I could figure it out eventually (or, god forbid, ask the boss), but I'd like to know what the command is and where I can find more information about it.