10-16-2012
Quote:
Originally Posted by
Don Cragun
Since the f1, f2, and f3 shown in your example are all identical; and since the string ("times gaped in last 1 hr.") that you say should appear in f3 does not appear in f3 in your example, I don't understand what you're trying to do. Subtracting 0 from 0 yielding 0 doesn't provide a good example of what you want to have happen.
I'm also not at all sure what you expect to get when you subtract text fields from each other (e.g., "NORD_BALT_02" - "NORD_BALT_02") which is $4 in the 1st record in f1 and $4 in the 1st record in f2. (You talk about column 6 in the text of your message, but you subtract values of $4 in your awk script???)
It is not always "0". we get non-zero values too. $4 was the previous awwk, that contained 6th col value. now more columns are added so that became the 6th col in f1 and f2
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LEARN ABOUT FREEBSD
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)