<SYSTEM_TASK:>
Solve the following problem using Python, implementing the functions described below, one line at a time
<END_TASK>
<USER_TASK:>
Description:
 def choice_doinst(self):
 """View doinst.sh file """

        if "doinst.sh" in self.sbo_files.split():
            doinst_sh = ReadSBo(self.sbo_url).doinst("doinst.sh")
            fill = self.fill_pager(doinst_sh)
            self.pager(doinst_sh + fill)