Ruby常用文件操作代码实例

#建立一个222.rb文件并且输入字符file = File.open("222.rb","w+")file.puts "123/nwadwa/n12124124/ndwdw"file.close#输出222.rb的内容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/ #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 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")#判断文件是否存在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.stringputs ios.string.dump #忽略/n的转义#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")