The line("."), command gets the line in the current buffer. Whats the command to get line in an arbitrary buffer, using buffer numbers?
The getbufinfo() returns a list of dictionaries. One of the dictionary key is lnum - line number. One other key is bufn - buffer number.
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Note this function is a rather recent addition to vim's libraries (post 7.4.2204, Aug 2016) – user1138184 Mar 26 '17 at 14:32
:h getbufline()– Christian Brabandt Mar 21 '17 at 11:19