For a couple of reasons, trajectory files generated from DL_POLY occasionally have no header - addheader allows one to be copied from an existing history file, and prepended to the target history file.
addheader <HEADERfile> <input HISTORYfile> <output HISTORYfile>Where:
<HEADERfile> is the name of the DL_POLY HISTORY file from which the header is to be copied<input HISTORYfile> is the name of the DL_POLY HISTORY file which is missing its header<output HISTORYfile> is the name of the new DL_POLY HISTORY file to writeNo switches exist for addheader.