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Full Discussion: Nawk special numbers
Top Forums Shell Programming and Scripting Nawk special numbers Post 302942435 by Don Cragun on Tuesday 28th of April 2015 04:18:50 PM
Old 04-28-2015
The POSIX standards for awk specify that it must behave as if it uses (at least) double precision floating point values as defined by the C Standard. When ptr points to a string starting with a case insensitive "infinity", "inf", or "NaN", the C standard requires strtod(ptr, endptr) to set endptr to point to the character after the last character matched from one of those three strings and return the double precision floating point format representation for an infinity, infinity, or Not A Number, respectively, on systems that also support the IEEE 754 floating point standard.

So, yes, POSIX requires what was reported on HP/UX and Solaris systems. (Note, however, that the POSIX conforming version of awk on Solaris systems is /usr/xpg4/bin/awk; not nawk.) I'm not sure where the "Q" in NaNQ reported on AIX is coming from. The gawk output shown on Windows appears to be non-conforming.

And, for the record, on OS X Yosemite 10.10.3, the output from those three commands is, respectively:
Code:
inf
nan
nan

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LEARN ABOUT DEBIAN

ppmtosixel

ppmtosixel(1)						      General Commands Manual						     ppmtosixel(1)

NAME

       ppmtosixel - convert a portable pixmap into DEC sixel format

SYNOPSIS

       ppmtosixel [-raw] [-margin] [ppmfile]

DESCRIPTION

       Reads  a  portable  pixmap  as input.  Produces sixel commands (SIX) as output.	The output is formatted for color printing, e.g. for a DEC
       LJ250 color inkjet printer.

       If RGB values from the PPM file do not have maxval=100, the RGB values are rescaled.  A printer control header and a color assignment table
       begin the SIX file.  Image data is written in a compressed format by default.  A printer control footer ends the image file.

OPTIONS

       -raw   If  specified,  each  pixel  will  be explicitly described in the image file.  If -raw is not specified, output will default to com-
	      pressed format in which identical adjacent pixels are replaced by "repeat pixel" commands.  A raw file is often an order	of  magni-
	      tude larger than a compressed file and prints much slower.

       -margin
	      If  -margin  is not specified, the image will be start at the left margin (of the window, paper, or whatever).  If -margin is speci-
	      fied, a 1.5 inch left margin will offset the image.

PRINTING

       Generally, sixel files must reach the printer unfiltered.  Use the lpr -x option or cat filename > /dev/tty0?.

BUGS

       Upon rescaling, truncation of the least significant bits of RGB values may result in poor color conversion.  If the original PPM maxval was
       greater	than  100,  rescaling  also reduces the image depth.  While the actual RGB values from the ppm file are more or less retained, the
       color palette of the LJ250 may not match the colors on your screen.  This seems to be a printer limitation.

SEE ALSO

       ppm(5)

AUTHOR

       Copyright (C) 1991 by Rick Vinci.

								   26 April 1991						     ppmtosixel(1)
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