pos |
Is a scalar default character variable that is assigned one of the following values:
'REWIND'
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If the file is connected with its position at its initial point
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'APPEND'
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If the file is connected with its position at its terminal point (or before its end-of-file record, if any)
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'ASIS'
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If the file is connected without changing its position
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'UNDEFINED'
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If the file is not connected, or is connected for direct access data transfer and a REWIND statement has not been performed on the unit
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