SELCOPY Examples Menu

The simplest of functions you can perform with SELCOPY are file copies. The following is a SELCOPY program which does this:

 READ  A
 WRITE B

The above represent the minimum elements required for a SELCOPY program. One selection (READ) must cause input, and one selection (WRITE) must cause output. In this case, SELCOPY will READ one logical record from file A and then copy it to file B. The READ/WRITE cycle is repeated until all of the records from file A are exhausted (i.e. end of file is reached) at which point, by default, SELCOPY will automatically terminate.

In addition to the control cards shown, a link must be provided between the filenames mentioned to SELCOPY (Files A & B in the above example) and the physical datasets to which they refer. These are:

• DD statements for MVS users,
• FILEDEF statements for CMS users, and
• TLBL, DLBL, EXTENT and ASSGN statements for VSE users.

Alternatively, SELCOPY will dynamically allocate files using a dataset name provided either as a literal or from a position in its work area. e.g.

 READ  A  DSN='SEQUENTIAL.INPUT.FILE'  VOL=SYSWK1
 WRITE B  DSN=44 AT 1001               CAT=UCAT1  VSAM