Provided by: xtide_2.13.2-1build1_amd64 bug


       tide - Harmonic tide clock and tide predictor (command line client)


       tide  [-b  ``YYYY-MM-DD  HH:MM'']  [-ch  pixels] [-cw pixels] [-dc color] [-Dc color] [-df
       ``format-string''] [-e ``YYYY-MM-DD  HH:MM'']  [-ec  color]  [-el  y|n]  [-em  pSsMm]  [-f
       c|h|i|l|p|t|v]  [-fc  color]  [-fg  color] [-ga aspect] [-gh pixels] [-gs d|l|s] [-gt y|n]
       [-gw pixels] [-hf ``format-string''] [-in y|n] [-l ``location  name'']  [-lw  pixels]  [-m
       a|b|c|C|g|k|l|m|p|r|s]  [-mc  color]  [-Mc  color]  [-ml [-]N.NN(ft|m|kt)] [-nc color] [-o
       ``filename''] [-ph mm] [-pi days] [-pm mm] [-pw mm] [-s ``HH:MM''] [-tf ``format-string'']
       [-th characters] [-tl y|n] [-to opacity] [-tw characters] [-u ft|m] [-v] [-z y|n]


       XTide  is  a  package  that  provides  tide  and  current predictions in a wide variety of
       formats. Graphs, text listings, and calendars can be generated, or a  tide  clock  can  be
       provided on your desktop.

       XTide can work with X-windows, plain text terminals, or the web. This is accomplished with
       three separate programs: the interactive interface (xtide), the non-interactive or command
       line interface (tide), and the web interface (xttpd).

       tide  is  the non-interactive command line client for XTide 2.  For a complete discussion,
       please see the verbose documentation at


       Unless a configuration file /etc/xtide.conf is supplied,  you  must  set  the  environment
       variable  HFILE_PATH to point to the harmonics files that should have been installed along
       with the xtide program.  Example:
              export HFILE_PATH=/usr/local/share/xtide/harmonics.tcd
       If a configuration file is used, the first line should consist of the colon-separated list
       of harmonics files (e.g. the HFILE_PATH line above without the "export HFILE_PATH=" part).
       The environment variable takes precedence over the configuration file.  Also, note that on
       Debian  systems  the  tidal  harmonics data file are stored in /usr/share/xtide instead of
       /usr/local/share/xtide as used above.

       Set the environment variable XTIDE_DEFAULT_LOCATION to the name of your favorite place  if
       you want to skip the location-choosing step.


       -b ``YYYY-MM-DD HH:MM''
              Specify  the begin (start) time for predictions using the ISO 8601 compliant format
              YYYY-MM-DD HH:MM, where hours range from 00 to 23.  The timestamp is in  the  local
              time  zone for the location, or in UTC if the -z setting is engaged.  If clock mode
              is selected or if no -b is supplied, the current time will be used.

       -ch pixels
              Height for tide clocks (default 312 pixels).

       -cw pixels
              Width for tide clocks (default 84 pixels).

       -dc color
              Daytime background color in tide graphs (default SkyBlue).

       -Dc color
              Color of datum line in tide graphs (default white).

       -df ``format-string''
              strftime(3) style format string for printing dates (default %Y-%m-%d).  Ignored  in
              calendar mode.

       -e ``YYYY-MM-DD HH:MM''
              Specify  the  end  (stop)  time for predictions in banner, calendar, alt. calendar,
              medium rare, plain, raw, or stats mode.  Does not apply in graph and  clock  modes:
              the  effective  end  time  for  graph and clock modes is entirely determined by the
              start time (-b), the width (-cw, -gw or -tw), and the aspect (-ga).  The format and
              time  zone  are the same as for -b.  If no -e is supplied, the end time will be set
              to four days after the begin time.

       -ec color
              Foreground in tide graphs during outgoing tide (default SeaGreen).

       -el y|n
              Select whether or not to draw datum and middle-level lines in tide graphs  (default

              The  National  Ocean  Service (NOS) defines both Mean Sea Level (MSL) and Mean Tide
              Level (MTL) in terms of averages taken over observations.  The middle-level line is
              drawn  at the midpoint of the theoretical tidal range, which usually corresponds to
              the mathematical mean level of the predictions.  This  approximates  both  MSL  and
              MTL,  but,  strictly  speaking,  is  equivalent  to neither.  Moreover, subordinate
              station offsets may shift the actual mean  so  that  it  no  longer  falls  at  the
              midpoint  of  the  tidal  range.   The datum line is drawn at the zero level of the
              predictions, which usually corresponds to the station's benchmark, but this too can
              be rendered inaccurate by subordinate station offsets.

       -em pSsMm
              Events  to  suppress (p = phase of moon, S = sunrise, s = sunset, M = moonrise, m =
              moonset), or x to suppress none.  E.g, to suppress all sun  and  moon  events,  set
              eventmask to the value pSsMm.

       -f c|h|i|l|p|t|v
              Specify  the  output format as CSV, HTML, iCalendar, LaTeX, PNG, text, or SVG.  The
              default is text.

       -fc color
              Foreground in tide graphs during incoming tide (default Blue).

       -fg color
              Color of text and other notations (default black).

       -ga aspect
              Aspect for tide graphs, clocks, and banners (default 1.0).  This controls  not  the
              width  or  height of the window but rather the relative scaling of the X and Y axes
              in the plot of the tide curve.

       -gh pixels
              Height for tide graphs (default 312 pixels).

       -gs d|l|s
              Style  of  graphs  and  clocks.   Valid  values:   d   (default),   l   (line),   s

       -gt y|n
              Select whether or not to label tenths of units in tide graphs (default n).

       -gw pixels
              Width for tide graphs (default 960 pixels).

       -hf ``format-string''
              strftime(3) style format string for printing hour labels on time axis (default %l).

       -in y|n
              Select  whether  or  not  to use inferred values for some constituents (default n).
              For expert use only.

       -l ``location name''
              Specify a location for tide predictions.

       -lw pixels
              Width of line in graph styles l and s (default 2.5 pixels).

       -m a|b|c|C|g|k|l|m|p|r|s
              Specify mode to be about, banner, calendar,  alt.  calendar,  graph,  clock,  list,
              medium rare, plain, raw, or stats.  The default is plain.

       -mc color
              Color of mark line in graphs (default red).

       -Mc color
              Color of middle-level line in tide graphs (default yellow).

       -ml [-]N.NN(ft|m|kt)
              Specify the mark level to be used in predictions.  The predictions will include the
              times when the tide level crosses the mark.  Not supported in clock mode.   Example
              usage: -ml -0.25ft

       -nc color
              Nighttime background color in tide graphs (default DeepSkyBlue).

       -o ``filename''
              Redirect output to the specified file (appends).

       -ph mm Nominal length of paper in LaTeX output (default 420 mm).  This need not match your
              actual paper; use "Shrink oversized pages" in print options.

       -pi days
              Number of days of predictions to generate when no end time  is  specified  (default

       -pm mm Nominal  width  of  top, bottom, left and right margins in LaTeX output (default 10
              mm).  Actual width will depend on print scaling.

       -pw mm Nominal width of paper in LaTeX output (default 297 mm). This need not  match  your
              actual paper; use "Shrink oversized pages" in print options.

       -s ``HH:MM''
              Specify  the  step  interval,  in  hours  and  minutes, for raw or medium rare mode
              predictions.  The default is one hour.

       -tf ``format-string''
              strftime(3) style format string for printing times (default %l:%M %p %Z).

       -th characters
              Height of ASCII graphs and clocks (default 24 characters).

       -tl y|n
              Select whether or not to draw depth lines on top of the tide graph (default n).

       -to opacity
              Opacity of the fill in graph style s (semitransparent) (default 0.65).

       -tw characters
              Width of ASCII graphs, clocks, banners, and calendars (default 79 characters).

       -u ft|m
              Preferred units of length (default no preference).

       -v     Print version string and exit.

       -z y|n Select whether or not to coerce all time zones to UTC (default n).


       If the environment variable TERM is set to vt100 or vt102, tide will take it seriously and
       invoke the DEC Special Graphics character set in text form output.


       xtide(1), xttpd(8),