IF S

Conditionally executes a Proc command based on the presence or absence of an active select list.

Syntax

IF {#} S command

Syntax elements

# tests for the absence of a select list.

command is a valid Proc command.

Operation

IF S command executes command if a select list is active.

IF # S command executes command if no select list is active.

Examples

PQN
  IF S G F
1 OEnter list name +
  IP %1
  IF # %1 G 1
  HGET-LIST
  A1
  STON

M
  HPQ-SELECT 1
  P

M
  MV %1 !1
  IF # %1 G F
  T %1
  G B
M OAll Item-Ids Output
  X

This Proc checks for an active list. If one exists, it is read into select register 1. If there is no active list, the user is prompted for a list name. Once a list is retrieved, its item-ids are output in turn before the Proc terminates.

IF # S G 200

IP?

.

.

.

If there is no active select list, go to label 200; otherwise prompt for input.