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Full Discussion: awk PID
Top Forums Shell Programming and Scripting awk PID Post 302504447 by Corona688 on Monday 14th of March 2011 03:48:04 PM
Old 03-14-2011
You've still given no context, so I can't explain why they're doing what they do.

I don't know what that "PID" variable is. It must have been set somewhere else. I don't know what SC is either. I also don't know why they're checking for 7, or what tommcumulative is.

All I can tell you is, it's doing this: "if the first token is tommcumulative, and the PID is 7, print the string ",CUM_READ = to_number(%d,'XXXXXXXXXX')\n", substituting the second token times SC for %d. Otherwise, print ",CUM_READ = %d\n", substituting the second token times SC for %d. And if the first token isn't tommcumulative, don't do anything inside this block at all."

In the second line, they're matching lines containing the text "txOnlyProtocolID" from the file $remoteTmpOnDir/ond.tmp.$1. I don't know what $remoteTmpOnDir is, that must have been set earlier. I don't know what $1 is, that's the first parameter of the script. And they feed the output through awk, printing only the sixth field, and shoehorn the whole mess into the Protocol_id variable.
Protocol_id=`grep txOnlyProtocolID $remoteTmpOndDir/ond.tmp.$1 | awk '{print $6}'`

For the third one, they're running the awk script $BIN_DIR/odr_crupdt.awk. I don't know what BIN_DIR is, that's something that's set earlier. They're presetting a whole bunch of variables in there, some of which correspond to variables used earlier, like SC=$SCALING_CONST and INT=$DEMAND_INTRVL, and of course that PID variable that got grepped out of that file, whatever it is. What they are and why I couldn't say. What $1 is I also couldn't say.
 

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LEARN ABOUT MINIX

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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