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

[ZHANG Cheng]

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!