取出文本中的第二列
直接上代码
#!/usr/bin/env ruby
#encoding: utf-8
filename = ARGV[0]
file = File.open(filename)
=begin
逐列打印
=end
file.each_line do |line|
myline = line.chomp!
ary = myline.readlines
puts ary[1]
end
file.close
用each_line逐行遍历,然后用readlines将行内容变为数组,然后取出数组中的元素。
注:chomp!用于删除换行符
split方法用法更广泛一点,可以替代readlines方法。
split方法将正则表达式作为分隔符,默认为空格,也可以省略
#!/usr/bin/env ruby
#encoding: utf-8
filename = ARGV[0]
file = File.open(filename)
=begin
逐列打印
=end
file.each_line do |line|
myline = line.chomp!
ary = myline.split(/\s+/)
puts ary[1]
end
file.close
(/\s+/)是正则表达式,标识一个或多个空格