How to concatenate the pullf.xvg files

GROMACS version: 2019.4
GROMACS modification: Yes/No

Dear Gromacs users,
I have simulated the Umbrella Sampling with lipid bilayer system.
After I run simulation, I run ‘gmx wham’ and noticed that the system does not converge.
So because I wanted to run simulation in succession, I used the command line below:

gmx convert-tpr -s SAMPLING/dist_23/md_umbrella_23.tpr -o SAMPLING/dist_23/md_umbrella_23_next.tpr -extend 800000
gmx mdrun -deffnm SAMPLING/dist_23/md_umbrella_23_next -cpi md_umbrella_23.cpt -noappend

But in prompting the ‘gmx wham’ there is need to concatenate the previous pullf.xvg file and pullf_next.xvg file.

Is there any way to address the situation?

Thank you.

They’re just text files. You can combine them with whatever text editor you like (or Linux cat).

Thank you for your reply, jalemkul

As I know the pullf.xvg file has time values in first column and force values in second column, I concerned about whether ‘gmx wham’ is independent of time or not

Does not merely concatenating two files(pullf.xvg and pullf_next.xvg) raise any problem?

The time values should be sequential since you are continuing a run. The only thing you’ll have to remove are the intervening header/comment lines in pullf_next.xvg.

Ah Oh very very thank you! :) bb