cbsfpfg `echo "esel"$REE esel`

##</code><code>##

system (qq(cbsfpfg `echo "esel"$REE esel`));

also 

system (cbsfpfg `echo "esel"$REE esel`);

##</code><code>##

'cbsfpfg' is not recognized as an internal or external command,
operable program or batch file.