如何使用Ruby删除文本文件中间的数据行

参考：https://www.it1352.com/752703.html

读取文件每一行，判断是否存在匹配的字符串，空格替换掉那一行

文件内容(test.txt)：

Person1,will,23
Person2,Richard,32
Person3,Mike,44

示例代码(test.rb)：

filename='/Users/weever/Desktop/test.txt'
puts "当前目录："+filename

puts "处理前"
File.new(filename).each {|line| p line }

puts "处理开始"
f = File.new(filename, 'r+') #"r+" Read-write, starts at beginning of file.
f.each do |line|
  if line.include?('Person2')
    #seek back to the beginning of the line.
    f.seek(-line.length, IO::SEEK_CUR)
    #overwrite line with spaces and add a newline char
    f.write(' ' * (line.length - 1))
    f.write("\n")
  end
end
f.close

puts "处理结束"
File.new(filename).each {|line| p line }

ruby test.rb执行结果：

当前目录：/Users/weever/Desktop/test.txt
处理前
"12343\n"
"345678\n"
"90-=\n"
"76\n"
"\n"
"Person1,will,23\n"
"Person2,Richard,32\n"
"Person3,Mike,44"
处理开始
处理结束
"12343\n"
"345678\n"
"90-=\n"
"76\n"
"\n"
"Person1,will,23\n"
"                  \n"
"Person3,Mike,44"