What does 'pos' for SAS variables exactly mean?

[osho]

What does 'pos' for SAS variables exactly mean?

[Doc_Duke]

please provide more context. Where are you seeing this?

[osho]

When I do proc contents, it gives me a list of variables with type, length, format, informat and pos. What is this pos?

[sbb]

Position in the SAS file.

[osho]

Is the pos determined by SAS once I define the variables?
or do I have to explicity define pos every time I introduce a variable?
Thanks

[Doc_Duke]

How the position is determined is described in excruciating detail in the SAS documentation for the "SAS Data Files" under base SAS.