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Full Discussion: negatively concatenating files
Top Forums Shell Programming and Scripting negatively concatenating files Post 302213606 by raidzero on Thursday 10th of July 2008 02:54:20 PM
Old 07-10-2008
negatively concatenating files
That subject might sound weird. What I have is two files. One looks like:
Code:
rf17 pts/59 Jul 10 08:43 (10.72.11.22) 27718 pts/59  0:00 b
rf17 pts/3 Jul 10 10:03 (10.72.11.22) 32278  pts/3  1:43 b 
rf58 pts/29 Jul 10 10:09 (10.72.11.51) 44220 pts/29  0:06 b
rf58 pts/61 Jul 10 08:45 (10.72.11.51) 28542 pts/61  0:18 b
rf7 pts/15 Jul 10 10:43 (10.72.11.89) 52326 pts/15  0:00 b 
rf7 pts/49 Jul 10 08:33 (10.72.11.89) 58982 pts/49  0:06 b 
rf56 pts/28 Jul 10 10:04 (10.72.11.9) 17256 pts/28  0:19 b 
rf56 pts/55 Jul 10 08:36 (10.72.11.9) 35368 pts/55  0:49 b

The other looks like:
Code:
rf17 pts/3 Jul 10 10:03 (10.72.11.22) 32278  pts/3  1:43 b  
rf56 pts/28 Jul 10 10:04 (10.72.11.9) 17256 pts/28  0:19 b  
rf58 pts/29 Jul 10 10:09 (10.72.11.51) 44220 pts/29  0:06 b 
rf7 pts/15 Jul 10 10:43 (10.72.11.89) 52326 pts/15  0:00 b

I would like to be able to remove the contents of the second file from the first file, giving, for example, this:
Code:
rf17 pts/59 Jul 10 08:43 (10.72.11.22) 27718 pts/59  0:00 b
rf56 pts/55 Jul 10 08:36 (10.72.11.9) 35368 pts/55  0:49 b 
rf7 pts/49 Jul 10 08:33 (10.72.11.89) 58982 pts/49  0:06 b 
rf58 pts/61 Jul 10 08:45 (10.72.11.51) 28542 pts/61  0:18 b

The first file's contents are always changing, the second file's contents are derived from the first using sort -uk1,1. It might make more sense if I put it all in context. I am trying to make a script (cron job) that checks to see how many duplicate sessions there are for users, and then kill the oldest duplicates while keeping the newest one alive. I know this is possible, in my experience with Unix (and this board) anything is possible. Can somebody tell me how I can do this file operation?
Thank you
 

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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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