trimbom.py 

#!/usr/bin/python  #coding=utf-8    import os  import sys  import codecs    class RemoveBom:          basePath = ''      fileList = []      trimExtList = []            def showMessages(self):   print 'the Path is [',self.basePath,']'   n = ''   for ext in self.trimExtList:       n+=ext       n+=' '   print 'the Exts is [' ,n,']'        def trimFile(self,name):   file = open(name,'rb')   content = file.read(3)   if content != '\xEF\xBB\xBF':       return False   content = file.read()   file.close()   file = open(name,'wb')   file.write(content)   file.close   print 'convert ',name,' finish'   return True        def getFileList(self,path):   if not path:       return False   for root,dirs,files in os.walk(path):       for filename in files:    if filename.split('.')[-1] in self.trimExtList:     filepath=os.path.join(root,filename)     self.trimFile(filepath)     #print filepath        def run(self,argv):   self.basePath = os.path.normpath(argv[1])          if len(argv) < 3:              self.trimExtList.append('java')          else:       for i in range(len(argv)-2):                  self.trimExtList.append(argv[2+i])   self.showMessages()   self.getFileList(argv[1])    if __name__ == '__main__':   if len(sys.argv) < 2:              print 'USEAGE:python %s dirName [ext eg:java php cpp]' % __file__              sys.exit(0)      tObj = RemoveBom()   tObj.run(sys.argv)