sidef/scripts/RosettaCode/read_a_specific_line_from_a_file.sf

#!/usr/bin/ruby

#
## https://rosettacode.org/wiki/Read_a_specific_line_from_a_file
#

func getNthLine(filename, n) {
  var file = File.new(filename);
  file.open_r.each { |line|
     Num($.) == n && return line;
  };
  Sys.warn("file #{file} does not have #{n} lines, only #{Num($.)}\n");
  return nil;
}
 
var wantedLine = getNthLine("/etc/passwd", 7);
defined(wantedLine) && print wantedLine;