Are there any metadata editors compliant with ISO 19115 and/or FGDC metadata standards which can work with XML formatted metadata and run solely on the command line? Often times I'm working remotely or otherwise desire a headless environment and would like to do editing of metadata from the shell.
Most of the metadata editors I've seen either run in a GUI (i.e. CatMDEdit) or are web based like GeoNetwork. I've looked at this list of editors for now, and haven't really found anything that fits the bill.
Although I know the 'mp' program can validate metadata, I haven't come across an actual command line metadata editor yet. Any suggestions would be appreciated.