I've been able to track down basic head/tail functionality:

head -10 myfile <==> cat myfile | select -first 10
tail -10 myfile <==> cat myfile | select -last 10

But if I want to list all lines except the last three or all lines except the first three, how do you do that? In Unix, I could do "head -n-3" or "tail -n+4". It is not obvious how this should be done for PowerShell.