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

[Pedro Deira]

For a one command line in bash I would use

printf "r 1-442 \n q \n" | command

In echo it is similar but you need to work out the " and ' very carefully.

Cheers,


On Mon, 11 Feb 2019, 17:21 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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