Wikimedia Bugzilla is closed!

in compat:
replace.py -pagesgenerator -replacementfile:replace.txt 

this does not work for core,  the whole code part is missing here:

        elif arg.startswith('-replacementfile'):
            if len(arg) == len('-replacementfile'):
                replacefile = pywikibot.input(
                    u'Please enter the filename to read replacements from:')
            else:
                replacefile = arg[len('-replacementfile')+1:]
            try:
                commandline_replacements.extend(
                    [x.lstrip(u'\uFEFF').rstrip('\r\n')
                     for x in codecs.open(replacefile, 'r', 'utf-8')])
            except IOError:
                raise pywikibot.Error(
               '\n%s cannot be opened. Try again :-)' % replacefile)