Combine awk commands into one Post: 302979539

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Top Forums Shell Programming and Scripting Combine awk commands into one Post 302979539 by Don Cragun on Tuesday 16th of August 2016 04:35:14 AM

08-16-2016

Registered User

I refuse to attempt to do 1-liners where I can't see what it is doing. And, with no sample variable values and no sample data to work on and no description of the expected output, this is obviously totally untested, but should come close to what your unreadable pipeline did:

Code:

gawk -v ll="$LASTLINENUM" -v le="$LINEENDNUM" -v s1="$STRING1" \
     -v s2="$STRING2" -v bg="$BEFOREGLAF" -v ag="$AFTERGLAF" '
NR <= ll || NR > le {
	ndel++
	next
}
{	l[NR - ndel] = $0
}
$0 ~ s1 && $0 ~ s2 {
	for(i = NR - ndel - bg; i <= NR - ndel + ag; i++)
		o[i] = i
	t++
}
END {	for(i = 1; i <= NR - ndel; i++)
		if(o[i])
			print l[i]
	print t+0
}' "$LOGFILE"

I think that the expression NR - ndel keeps track of the NR value that would have been seen in the second awk script. Without understanding what the shell variables BEFOREGLAF and AFTERGLAF are doing in your script, I have no idea whether or not any of the ndel calculations are needed as is, could be simplified by changing those two shell variables, or could just be skipped entirely.

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LEARN ABOUT ULTRIX

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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