Running :command:`prody catdcd -h` displays:
usage: prody catdcd [-h] [--quiet] [--examples] [-s SEL] [-o FILE] [-n] [--psf PSF] [--pdb PDB] [--first INT] [--last INT] [--stride INT] [--align SEL] dcd [dcd ...] positional arguments: dcd DCD filename(s) (all must have same number of atoms) optional arguments: -h, --help show this help message and exit --quiet suppress info messages to stderr --examples show usage examples and exit -s SEL, --select SEL atom selection (default: all) -o FILE, --output FILE output filename (default: trajectory.dcd) -n, --num print the number of frames in each file and exit --psf PSF PSF filename (must have same number of atoms as DCDs) --pdb PDB PDB filename (must have same number of atoms as DCDs) --first INT index of the first output frame, default: 0 --last INT index of the last output frame, default: -1 --stride INT number of steps between output frames, default: 1 --align SEL atom selection for aligning frames, a PSF or PDB file must be provided, if a PDB is provided frames will be superposed onto PDB coordinates
Running :command:`prody catdcd --examples` displays:
Concatenate two DCD files and output all atmos: $ prody catdcd mdm2.dcd mdm2sim2.dcd Concatenate two DCD files and output backbone atoms: $ prody catdcd mdm2.dcd mdm2sim2.dcd --pdb mdm2.pdb -s bb