Method system_piped

IPython/core/interactiveshell.py:2651–2677

Call the given cmd in a subprocess, piping stdout/err Parameters ---------- cmd : str Command to execute (can not end in '&', as background processes are not supported. Should not be a command that expects input other than simple text.

(self, cmd)

    #-------------------------------------------------------------------------

    def system_piped(self, cmd):
        """Call the given cmd in a subprocess, piping stdout/err

        Parameters
        ----------
        cmd : str
            Command to execute (can not end in '&', as background processes are
            not supported.  Should not be a command that expects input
            other than simple text.
        """
        if cmd.rstrip().endswith('&'):
            # this is *far* from a rigorous test
            # We do not support backgrounding processes because we either use
            # pexpect or pipes to read from.  Users can always just call
            # os.system() or use ip.system=ip.system_raw
            # if they really want a background process.
            raise OSError("Background processes not supported.")

        # we explicitly do NOT return the subprocess status code, because
        # a non-None value would trigger :func:`sys.displayhook` calls.
        # Instead, we store the exit_code in user_ns.
        exit_code = system(self.var_expand(cmd, depth=1))
        self.user_ns['_exit_code'] = exit_code

        # Raise an exception if the command failed and system_raise_on_error is True
        if self.system_raise_on_error and exit_code != 0:
            raise CalledProcessError(exit_code, cmd)

    def system_raw(self, cmd):
        """Call the given cmd in a subprocess using os.system on Windows or