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xttpd(8)		    System Manager's Manual		      xttpd(8)

       xttpd - Harmonic	tide clock and tide predictor (web server)

       xttpd  [port]  [-cf  ``format-string'']	[-dc  color]  [-Dc color] [-df
       ``format-string''] [-ec color] [-el y|n]	[-em pSsMm] [-fc  color]  [-fg
       color]  [-ga  aspect]  [-gh  pixels] [-gs d|l|s]	[-gt y|n] [-gw pixels]
       [-hf ``format-string''] [-in y|n] [-lb y|n] [-lw	 pixels]  [-mc	color]
       [-Mc  color]  [-nc color] [-ou y|n] [-pb	y|n] [-pi days]	[-tf ``format-
       string''] [-tl y|n] [-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	gener-
       ated, 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).

       xttpd  is  an XTide web server. It provides web-based access to XTide's
       tide predictions	by allowing a web browser to  speak  directly  to  the
       XTide program in	HTTP.  xttpd can replace httpd or it can co-exist with

       At installation time, xttpd can be configured to	integrate with systemd
       or it can be used in conventional init mode.

       In  conventional	mode, if you run xttpd with no command line arguments,
       it will assume that it is replacing httpd and try to bind port  80.  If
       you  want it to co-exist	with an	existing server, or if you do not have
       privilege to get	port 80, give it the port number as the	first  command
       line argument:
	      %	xttpd 8080
       You  will  then need to link it up as in-
       stead of	just, but otherwise, no damage	 done.
       Similarly, if you wish to bind a	specific address, you can specify that
       as the first argument:
	      %	xttpd
       If you need to specify both address and port number, separate  the  two
       with a slash, like this:
	      %	xttpd
       IPv6 addresses and hostnames are	also accepted for the address.

       When  systemd  is used, the port	and address must instead be configured
       in systemd configuration	files.

       Once the	port is	established, xttpd will	try to set its UID and GID  to
       values  that  were  specified  at  compile time.	 If it is unable to do
       this, it	will log failure messages to syslog  and  then	exit.	Conse-
       quently,	if it is to be started by someone other	than root, that	user's
       UID and GID must	be configured at compile time.	Instructions for doing
       this are	available at

       For  a  complete	 discussion of the command line	options	and a detailed
       explanation of the XTide	package, please	see the	verbose	 documentation

       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.

       Set the environment variable XTTPD_FEEDBACK to change the mail feedback
       address for xttpd.

       -cf ``format-string''
	      strftime(3)  style  format string	for printing days in calendars
	      (default %a %d).

       -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).  For calendars	see -cf.

       -ec color
	      Foreground  in  tide  graphs  during outgoing tide (default Sea-

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

	      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  nei-
	      ther.   Moreover,	 subordinate station offsets may shift the ac-
	      tual 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	bench-
	      mark,  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 sup-
	      press all	sun and	moon events, set eventmask to the value	pSsMm.

       -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 (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	(semitransparent).

       -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 con-
	      stituents	(default n).  For expert use only.

       -lb y|n
	      Select whether or	not calendar mode inserts a line break	before
	      prediction values	(default n).

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

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

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

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

       -ou y|n
	      Select  whether or not to	print numbers with no ft/m/kt (default
	      n). Where	possible, adds a header	line stating the units and da-

       -pb y|n
	      Select whether or	not calendar mode inserts a page break and re-
	      peats the	station	header for each	month (default y).

       -pi days
	      Number of	days of	predictions to generate	when no	 end  time  is
	      specified	(default 4).

       -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).

       -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

       tide(1),	xtide(1),

XTide 2				  2016-01-25			      xttpd(8)


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