Re-formatting of data display Post: 302256174

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Top Forums Shell Programming and Scripting Re-formatting of data display Post 302256174 by Franklin52 on Saturday 8th of November 2008 11:24:30 AM

11-08-2008

Registered User

OK, here we go:

Code:

awk '{a[NR%4]=$0}
NR%4==2 {getline;print a[1],$0;getline;print a[2],$0
}' file

We use as subscript of the array a, the remainder of NR/4 (division of NR by 4) with the modulo (%) operator.
The first line has the subscript 1 % 4 = 1
The second line has the subscript 2 % 4 = 2

Line 1:

If the 1st line is read, a[NR%4] = a[1] contains the 1st line ($0).
NR%4 == 1 so the code of the 2nd are skipped.

Line2:

a[NR%4] = a[2] contains the 2nd line.
NR%4 = 2 so the commands of the 2nd line of the code are processed.
The 1st statement is getline to read the next line. We use getline to continue with the next statement after reading the next line.
Now $0 contains the 3th line.
The next command prints a[1] = the first 1 and $0 (the 3th line).
After that, we get the nextline. Now $0 contains the 4th line.
The last the command prints a[2] = the 2nd line and $0 (the 4th line).

The next line is the 5th line, NR%4 = 5%4 = 1 and the we start the sequence again of line 1 and so forth.

Regards

Last edited by Franklin52; 11-08-2008 at 01:55 PM..

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LEARN ABOUT OSX

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)