Printing bar numbers at regular intervals
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By setting the barNumberVisibility property, bar numbers can be printed at regular intervals. Here the bar numbers are printed every two measures except at the end of the line.
\version "2.24.0"
\relative c' {
  \override Score.BarNumber.break-visibility = #end-of-line-invisible
  \set Score.currentBarNumber = 11
  % Print a bar number every second measure
  \set Score.barNumberVisibility = #(every-nth-bar-number-visible 2)
  c1 | c | c | c | c
  \break
  c1 | c | c | c | c
}
\paper { tagline = ##f }