On 6/24/13 11:36 AM, raji_yu wrote:
Yes, that command works and the entry 13 is recognized as 'SOL'


OK, then you need to figure out why your shell doesn't understand the difference between an input stream and a command, otherwise you have to do all your selections via echo, which can be annoying for some commands. Presumably, though, pdb2gmx worked earlier in the tutorial workflow, did it not? Running pdb2gmx requires interactive selections (or a potentially very cumbersome echo series). If other commands work or if genion works in a new terminal window, probably some other process is causing the problem.

-Justin

--
========================================

Justin A. Lemkul, Ph.D.
Research Scientist
Department of Biochemistry
Virginia Tech
Blacksburg, VA
jalemkul[at]vt.edu | (540) 231-9080
http://www.bevanlab.biochem.vt.edu/Pages/Personal/justin

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