I installed rosetta3.1 on my system. Based on the backrub documentation, I did exactly the things as it said:
> cat << END_RESFILE > 2YPI.resfile
then I input the content as the documentation showed.
>backrub -database rosetta3_database -s 2YPI.pdb -ignore_unrecognized_res -resfile 2YPI.resfile
-pivot_residues 127 128 129 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178
the system showed following error message:
-bash: backrub: command not found
So, what is wrong? Why I could not repeat the example on rosetta3.1 website and why it could not even recognize the backrub command? Thanks a lot.