you might want to purge the debian installation of tide

sudo apt-get purge xtide

otherwise there might be config files lingering around that confound your 
new xtide installation.  ('apt-get remove' removes the software, but leaves 
configurations and data behind.  'apt-get purge' is more aggressive, and 
removes the configurations too.)

or you could do

sudo-apt-get install xtide

then put your new harmonics file somewhere, say

  /opt/tide/harmonics-dwf-20181227-free.tcd

then make the shell script at /opt/tide/tide.sh:

#!/bin/sh
HFILE_PATH=/opt/tide/harmonics-dwf-20181227-free.tcd tide "$@"

then set the permissions:

sudo chmod 755 /opt/tide/tide.sh

then use it in your forecast configuration:

    prog = /opt/tide/tide.sh

that way you can have both - the old xtide and the new xtide, so you can do 
direct comparisons from the command line.

m


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