1.4.2.6. - The Index File
Indexing a long ASCII
data file to find at what byte offset each
scan begins takes time.
Once
scans.4
has indexed a file, it saves the index information in
a binary-format
index
file.
The name of the index file is formed
by appending
.I
to the original data-file name.
As long as the index file is more recent than the data
file,
scans.4
will take the index information from the index
file.
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