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Full Discussion: take a section of a data with conditions
Top Forums Shell Programming and Scripting take a section of a data with conditions Post 302691829 by Don Cragun on Sunday 26th of August 2012 01:05:58 AM
Old 08-26-2012
agama said he found a # by itself on a line as the section separator. When I copied the sample input and fed it through od -cb, I found that the separator line contained the octal byte values 343, 200, and 200 terminated by the <newline> character.

I believe the following meets the criteria specified, but nothing will be printed given the sample input because no section header in the sample input has $12 > 3.
Code:
awk 'BEGIN {line1 = 1} # Next line with no alpha-numeric is a section header.
!/[0-9a-zA-Z]/ { # Found what is assumed to be a blank line.
        # The sample input had three bytes with octal values 343, 200, and 200
        #   followed by a <newline> as the separator between sections.
        #   The submitter described this as a "blank line".
        # This script will use empty lines as section separators no matter what
        #   section separator lines are found in input files.
        copy = 0 # Turn off copy mode.
        line1 = 1 # The next non-"blank" line is a sectoin header.
        next
}
copy    {print;next} # Copy any lines found before the next "blank" line.
line1   {if(($1 ~ /^2011/) && ($12 > 3)) { 
                # The text in the first post in this thread said sections were
                #   to be printed only for the year 2011 and $12 is > 3.
                # The script in the first post was looking for years 2010-2019.
                # All entries in the sample input were for 2011, but no entries
                #   had $12 > 3 (the only entries had $12 set to 2.1 and 1.7,
                #   so no entries match the criteria.
                copy=1 # Turn on copy mode for the rest of the section.
                # Add an empty line as a section separator, except before the 1st
                #   section to be printed.
                if(found++ > 0) print ""
                print # Print the 1st line of the section.
        } 
        # Whether a match was found or not, don't look for another seciion
        #   header until we find another separator line.
        line1 = 0
}' input

These 2 Users Gave Thanks to Don Cragun For This Post:
agama saeed.soltani
 

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LEARN ABOUT OSF1

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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