Selective printing based on matched record Post: 302995666

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Top Forums Shell Programming and Scripting Selective printing based on matched record Post 302995666 by Don Cragun on Monday 10th of April 2017 09:22:09 AM

04-10-2017

Registered User

Quote:

Originally Posted by MadeInGermany

The index() function is described in

Code:

man awk

The (c && c--) is an implicit if condition; if it evaluates to true it prints $0 (the default action for an implicit if).
If c is non-zero it evaluates c-- that is also non-zero but then decrements c. After c times c is zero and it does no further decrement and no default-print.
I don't like c-->0 because it keeps c decrementing, hoping it will not underflow or wrap around after a zillion times.

Code:

awk -v A=5 '(/^0[67][MV]/ && index($0,"003529")==26) {c=A+1} (c && c--)' file

Note that index($0,"003529")==26 may give a false negative result if the string 003529 appears starting at offset 26 and at some other place in the line before position 26. If there is any chance that that string could occur at an earlier position in the line, the ERE used by Scrutinizer (updated to match your complete requirements ^0[67][MV].{22}003529) or the substring check used by RudiC (substr($0, 26, 6) == "003529") would be safer.

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LEARN ABOUT V7

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)