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Hello Justin, Depending upon the OS of the machine, there may not be a “python” installed by default on the system, i.e., you need to choose either python2 or python3.  Given some scripts may still look for “python”, then you can add an alias in your shell init file so “python” points to what’s available. - R. ubuntu20:~$ which python ubuntu20:~$ which python2 ubuntu20:~$ which python3 /bin/python3ubuntu20:~$ python3 --version Python 3.8.10

ubuntu20:~$ alias python='python3' ubuntu20:~$ python --version Python 3.8.10

On Feb 6, 2023, at 00:53, Justin Oh <ohjp89@gmail.com> wrote:        External Email - Use Caution        Hi all, I am trying to run preproc-sess on a resting state MRI. I believe my directory is set the way it should be. There was an error that stopped the pipeline: env: python: No such file or directoryCould anybody help me out? All the best,Justin Oh_______________________________________________Freesurfer mailing listFreesurfer@nmr.mgh.harvard.eduhttps://mail.nmr.mgh.harvard.edu/mailman/listinfo/freesurfer%E2%80%8B