wezterm/docs/config/lua/pane/get_lines_as_text.md

pane:get_lines_as_text([nlines])

Since: nightly builds only

Returns the textual representation (not including color or other attributes) of the lines of text in the viewport as a string.

If the optional nlines argument is specified then it is used to determine how many lines of text should be retrieved. The default (if nlines is not specified) is to retrieve the number of lines in the viewport (the height of the pane).

The lines have trailing space removed from each line. The lines will be joined together in the returned string separated by a \n character. Trailing blank lines are stripped, which may result in fewer lines being returned than you might expect if the pane only had a couple of lines of output.