#建立一个222.rb文件并且输入字符 file = File.open("222.rb","w+") file.puts "123nwadwan12124124ndwdw" file.close #输出222.rb的内容 File.open("222.rb","r+") do |file| while line = file.gets puts line end end #直接用IO操作文件 IO.foreach("222.rb") do |line| puts line if line =~/abc/ #输出匹配到了'abc'的所在行 puts line if line !~/qwe/ #输出没有匹配到'qwe'的所在行 end #输出文件的绝对路径 puts File.expand_path("222.rb") #count chars from a file file= File.new("222.rb") w_count = 0 file.each_byte do |byte| w_count += 1 if byte =="#{w_count}" #create new file and write some words there print "The file now is exist" puts File.exist")#判断文件是否存在 file= File.new("asd.txt","w") print "The file now is exist" puts File.exist") file.write("hehenhahah") #io.stream operation require 'stringio' ios = StringIO.new("abcdefn ABC n 12345") ios.seek(5) #把偏移指针移到5（e字母所在位置） ios.puts("xyz3") #从5开始覆写原有数据 puts ios.tell #tell--Returns the current offset (in bytes) of ios. puts ios.string puts ios.string.dump #忽略n的转义 #another example require 'stringio' ios = StringIO.new("abcdefnq9ert n 12345") ios.seek(3) ios.ungetc(?w) #replace the char at index 3 puts "Ptr = #{ios.tell}" s1 = ios.gets #filte the "n" s2 = ios.gets puts s1 puts s2 #Ruby打开文件并写入数据操作 txt = File.open("文件路径","w+") txt.puts '要写入的文件内容' txt.close #从文件里读取数据 num = File.readlines("文件路径")[0].chomp #打开文件的方法 system("notepad 文件路径")
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