Programmer Utilities › Lists › Combining Lists

Combining Lists

The Toolkit command Operate on List (YOPRLST) gives you the ability to combine or divide lists. Lists can be combined together using set theory operations such as intersection and union. Such a capability is very powerful and can be used in many ways. Here are some examples:

• To compare two libraries and list the differences, build a list of the desired type from the contents of each library, use the Operate on List function to create a list of the differences, and then use the Document List (YDOCxxxLST) function to print the result list.

YBLDOBJLST OBJ(A/*ALL) OBJLST(A) /* library A contents */
YBLDOBJLST OBJ(B/*ALL) OBJLST(B) /* library B contents */
YOPRLST LSTTYPE(*OBJ) LSTA(A)
LSTOPR(*DIFF) LSTB(B)
TOLST(C) IGNLIB(*YES) /* differences */
YDOCOBJLST LSTB(C) /* print */

• To compare two libraries and list all the objects which have identical names, creation dates/times and change dates/times, use the YOPRLST command with LSTOPR(*INTERSECT).

YBLDOBJLST OBJ(A/*ALL) OBJLST(A)/* library A contents */
YBLDOBJLST OBJ(B/*ALL) OBJLST(B)/* library B contents */
YOPRLST LSTTYPE(*OBJ) LSTA(A)
LSTOPR(*INTERSECT) LSTB(B)
TOLST(C) IGNLIB(*YES) IGNCRTDTE(*NO)
IGNCHGDTE(*NO)/* find identical obj */
YDOCOBJLST LSTB(C)/* print*/

• To find out if all the objects in a library have a corresponding source member, build an object list of the objects, and convert it to a member list using the Convert Object List function (YCVTOBJLST). The member list so created could then be subtracted, using the Operate on List function from a member list built from the source file itself. The resulting list, which can be printed, represents the objects without source.

YBLDOBJLST OBJ(A/*ALL) OBJLST(A) /* library A contents */
YCVTOBJLST OBJLST(A) MBRLST(A)/* library a contents */
YBLDMBRLST FILE(B/Q*) MBRLST(B)/* src files in b contents */
YOPRLST LSTTYPE(*MBR) LSTA(A)
LSTOPR(*SUB) LSTB(QTEMP/B)
TOLST(QTEMP/C) IGNLIB(*YES) /* differences */
YDOCOBJLST LSTB(QTEMP/C) /* print */

• To change the ownership of everything in a library, except for a given list of exceptions, build a list of everything in the library, subtract the exceptions, then change the ownership of the remainder.