[pymvpa] afni installation

[jian hou]

Hi all,
I‘m new to debian (linux). I installed afni but the command (e.g. 3dFWHMx) didn't work. It seems that I should add . /etc/afni/afni.sh to my bash.bashrc file. However, the bash.bashrc file is read-only. How could I edit it? 
Thanks in advance.
Best regards.
Jian Hou
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