#建立一個222.rb文件并且輸入字符file = File.open("222.rb","w+")file.puts "123/nwadwa/n12124124/ndwdw"file.close#輸出222.rb的內容File.open("222.rb","r+") do |file|while line = file.getsputs lineendend#直接用IO操作文件IO.foreach("222.rb") do |line|puts line if line =~/abc/ #輸出匹配到了'abc'的所在行puts line if line !~/qwe/ #輸出沒有匹配到'qwe'的所在行end#輸出文件的絕對路徑puts File.expand_path("222.rb")#count chars from a filefile= File.new("222.rb")w_count = 0file.each_byte do |byte|w_count += 1 if byte ==?1endputs "#{w_count}"#create new file and write some words thereprint "The file now is exist? --> " puts File.exist?("asd.txt")#判斷文件是否存在file= File.new("asd.txt","w")print "The file now is exist? --> " puts File.exist?("asd.txt")file.write("hehe/nhahah")#io.stream operationrequire 'stringio'ios = StringIO.new("abcdef/n ABC /n 12345")ios.seek(5) #把偏移指針移到5（e字母所在位置）ios.puts("xyz3") #從5開始覆寫原有數據puts ios.tell #tell--Returns the current offset (in bytes) of ios. puts ios.stringputs ios.string.dump #忽略/n的轉義#another examplerequire 'stringio'ios = StringIO.new("abcdef/nq9ert /n 12345")ios.seek(3)ios.ungetc(?w) #replace the char at index 3puts "Ptr = #{ios.tell}"s1 = ios.gets #filte the "/n" s2 = ios.getsputs s1puts s2#Ruby打開文件并寫入數據操作txt = File.open("文件路徑","w+")txt.puts '要寫入的文件內容'txt.close#從文件里讀取數據num = File.readlines("文件路徑")[0].chomp#打開文件的方法system("notepad 文件路徑")