[gmx-users] extracting specfic trajectories?

[minnale]

Hi all, 
I have run the simulation with 100 steps interval in .log file till 5ns, now I want to extract the new trajectory file should conatin with 1000 steps inerval trajectories excluding remain steps. I want new trajectory like 1000, 2000, 3000, 4000, 5000,....... steps.
Could anyone tell me detail suggestion please.
Thanks in advance.
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