1 10/27/80 - New Features of the Lister commands
 2 
 3 This info segment contains information about the new features found in the
 4 Lister commands. The new features are:
 5 (1) describe_list implemented
 6 (2) display_list implemented
 7 (3) modify_list implemented
 8 (4) append_list implemented
 9 (5) unique id feature implemented with incompatible change.
10 
11 
12 describe_list:
13 The describe_list command/active function gives information about the
14 lister file.  The record and field delimiters are given.  The names of
15 the fields are given.  The total number of records is given, or, if a
16 selection expression is specified, the total number of records that
17 match that expression is given.
18 
19 
20 display_list:
21 The display_list command/active function displays selected fields from
22 selected records.
23 
24 
25 modify_list:
26 The modify_list command assigns a value to a selected record or
27 records.
28 
29 
30 append_list:
31 The append_list command appends a record to a lister file.
32 
33 
34 Unique id feature:
35 A lister record has associated with it a decimal integer that can be
36 referenced as :uid in a selection expression, a listform segment or by
37 display_list.  An incompatible change has been made to the structure
38 of the lister file.  The lister file will be converted to the new
39 format when a modification is made to the file or when an attempt to
40 reference the unique id is made.  In order to affect this change, you
41 must have w access to the lister file.  If you wish to convert the file
42 manually, you can do so by using the create_list command.  If the
43 lister file is more current than the listin file or the listin file
44 does not exist, use expand_list to recreate the listin.
45 
46 Example:
47           expand_list my_file
48           create_list my_file