tide(1) 						      General Commands Manual							   tide(1)

NAME

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

SYNOPSIS

       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] [-fc color] [-fg color] [-ga aspect] [-gh pixels]	[-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] [-nf y|n] [-o ``filename''] [-ph mm] [-pm mm] [-pw mm] [-s ``HH:MM''] [-tf ``format-string''] [-tl y|n] [-th characters] [-tw  char-
       acters] [-u ft|m] [-v] [-z y|n]

DESCRIPTION

       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  inter-
       face (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
       http://www.flaterco.com/xtide/.

CONFIGURATION

       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.

OPTIONS

       -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).

       -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 n).

       -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
	      Specify the output format as CSV, HTML, iCalendar, LaTeX, PNG, or text.  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 rela-
	      tive scaling of the X and Y axes in the plot of the tide curve.

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

       -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 for lines in tide graphs with -nf (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).

       -nf y|n
	      Select whether or not to draw tide graphs as line graphs (default n).

       -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.

       -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).

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

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

       -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).

SEE ALSO

       xtide(1), xttpd(8), http://www.flaterco.com/xtide/.

XTide 2 							    2009-09-10								   tide(1)