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Full Discussion: Using quotes in awk
Top Forums Shell Programming and Scripting Using quotes in awk Post 302976172 by Don Cragun on Friday 24th of June 2016 01:59:30 PM
Old 06-24-2016
It is not restricted to AIX. The standards explicitly state that the input Record Separator is the 1st character or the string assigned to RS and the results are unspecified if the string assigned to RS contains more than one character. Some implementations of awk allow using an ERE in RS (which is required by the standards for FS, but not for RS). The behavior you are seeing on AIX is common for most implementations of awk on UNIX and BSD systems. Most, if not all, Linux systems support the extension that allows RS to be set to an ERE.

With a standards-conforming awk:
Code:
awk '
c == 0 {
	f1 = $0
	c = 1
	next
}
c == 1 {
	print f1 $0
	c = 2
}
NF == 0 {
	c = 0
}' file1

should do what you want.

If someone wants to try this on a Solaris/SunOS system, change awk to /usr/xpg4/bin/awk or nawk.
This User Gave Thanks to Don Cragun For This Post:
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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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