(alphabetical., ascending number, etc.), whereas an append action simply
adds all the items in a file to the end of another file, as the COPY command
of MS-DOS can do.
Updating a batch file
The principle of batch use of a computer is that a complete batch of records
will be processed in a run which is made at some time later than the arrival of
the data. A typical example is the processing of sales invoices after closing
hours,
and we need to look now at what the operator of the computer has to
do in order to process a batch of invoices or other documents for this
purpose. One very important aspect of this type of input is
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