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this sounds far too complicated for me. it is indeed just typing a number and hitting ENTER, but trying to understand how to use for instance expect will cost me too much time i guess.

if someone...

OK, I'm convinced and will try to explain in more detail. The command in question is called gmx genion from the Gromacs package for molecular dynamics simulations. When executing it in a bash...

but that one-liner (which wouldn't work like that anyways) contains two calls of command. i would like to know, for several reasons, whether this can be done with a single call of command.

Hi there,

I need to execute a command in the bash. The program prints some standard (output and) error and then wants the user to choose one of several options and type the according input. I am...