[gmx-users] How to use "echo" to output index file with only one command line?

[Mark Abraham]

Hi,

Like

echo "r 1-442\nq" | gmx make_ndx -f equilibration.gro

The "\n" is the code for a new line.

Mark

On Mon, 11 Feb 2019 at 18:22 ZHANG Cheng <272699575 at qq.com> wrote:

> Dear Pedro Deira,
>
>
> Sorry, could you please show me how to include the newline using "echo"
> with only one command line?
>
>
> Yours sincerely
> Cheng
>
>
>
>
> ------------------ Original ------------------
> From:  "ZHANG Cheng"<272699575 at qq.com>;
> Date:  Mon, Feb 11, 2019 06:36 AM
> To:  "gromacs.org_gmx-users"<gromacs.org_gmx-users at maillist.sys.kth.se>;
>
> Subject:  How to use "echo" to output index file with only one command
> line?
>
>
>
> I can successfully output the index file by doing it step by step:
>
>
> $ gmx make_ndx -f equilibration.gro
> $ r 1-442
> $ q
>
>
> But I am not sure how to do it in just one line.
>
>
> I tried these but all could not work
>
>
> $ echo r 1-442 q | gmx make_ndx -f equilibration.gro
> $ echo "r 1-442" q | gmx make_ndx -f equilibration.gro
> $ echo "r 1-442" "q" | gmx make_ndx -f equilibration.gro
>
>
> Thank you!
> --
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