MISSOVER was originally created to be used in conjunction with PAD and works effectively and well in most situations. However, this can be a CPU intensive process when reading an extremely large file.
STOPOVER is a good tool for checking code and raw data when dealing with large, potentially messy files, since it forces the DATA step to stop the first time it finds a short line.
TRUNCOVER was developed later than the MISSOVER and PAD options, and deals admirably with not only short lines but with short values. TRUNCOVER is more also efficient since it doesn't require the extra "padding".
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