SWI-Prolog -- line

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Documentation
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  - Built-in Predicates
    - Status of streams
- Packages

Availability:built-in

line_position(+Stream, -Count)

Unify Count with the position on the current line. Note that this assumes the position is 0 after the open. Tabs are assumed to be defined on each 8-th character, and backspaces are assumed to reduce the count by one, provided it is positive.