<
Means Move, I/O Redirection or Backward Page
Less than "<" in the Add command means to move the lines instead of copying them:
/add 5 < 10/20 {move lines 10/20 after line 5}
Less than "<" in an HP/UX command means to read input from an external file.
!a.out < test.scriptLess than "<" in the Visual home line means to move backwards one or more pages.
===><3 {move back 3 pages after Enter or F7}