structure @pti.psf end dynamics merge ascii=true input=pti_00_50.crd input=pti_50_100.crd begin=1000 skip=1000 stop=100000 oasci=true output=pti_00_100.crd endThe next example writes only the backbone coordinates to a new file at every 5000 steps:
structure @pti.psf end constraints fix (not((segid 4pti) and (name ca or name cb or name n)) end dynamics merge asci=true input=pti_00_100.crd begin=5000 skip=5000 stop=100000 oasci=false output=pti_00_100.bb.crd end