SELCOPY
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Changing record formats is another example of the ease of coding SELCOPY
control statements.
A Master file of customer records is kept on tape. Each record holds 40
bytes of fixed information for the customer in the first part of the
record, and variable information at the end. The average record length is
600 bytes.
It is a requirement to produce a file containing only the fixed data, to
reduce run times during small 'batch windows'. The abbreviated file is to
be blocked to 32000 bytes.
READ TAPE RECFM=V
WRITE TAPE1 LRECL=40 BLKSIZE=32000 RECFM=F
Note that SELCOPY will automatically strip off the 4 bytes of control
information when copying from variable to fixed length records.
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