fl Command

The fl BASIC program forms a single list from two lists using intersection, union, or exclusion operators.

Syntax

fl file.reference1 list1 {operators} {file.reference2} {list2}

fl ?

Parameter(s)

list1

First list.

list2

Second list.

operators

=

Indicates an intersection. Forms list of matching items.

+

Indicates a union. Forms list of nonduplicate items.

-

Indicates an exclusion. Forms list of items not in list2.

?

Displays help text on the screen.

If file.reference2 is not specified, it is assumed to be the same as file.reference1. If list2 is not specified, it is assumed to be the same as list1. If neither file.reference2 nor list 2 are specified, the effect is the same as a get-list. The created list overlays list1 in file.reference1.

Example(s)

Creates a list of all sports fans from both lists.

fl pointer-file football.fans + baseball.fans

Creates a list of those who enjoy both sports.

fl pointer-file football.fans = baseball.fans

Creates a list of those who like football only.

fl pointer-file football.fans - baseball.fans

See Also

Active List

compare-list Command

copy-list Command

delete-list Command

edit-list Command

get-list Command

nselect Command

readnext Statement

save-list Command

Secondary List

sort-list Command