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Full Discussion: Generate separate files with similar and dissimilar contents
Top Forums Shell Programming and Scripting Generate separate files with similar and dissimilar contents Post 302977980 by Don Cragun on Monday 25th of July 2016 03:42:11 AM
Old 07-25-2016
Note that:
Code:
grep -Fvf 2.txt 1.txt && grep -Fvf 1.txt 2.txt

won't look for lines in 2.txt that are not in 1.txt if there aren't any lines in 1.txt that are not in 2.txt. It would seem that:
Code:
grep -Fvf 2.txt 1.txt ; grep -Fvf 1.txt 2.txt

would be more likely to give you what you want.

Note also that if you are only looking for complete line matches when looking for matching lines, you probably also want complete line matches when looking for non-matching lines. That would be:
Code:
grep -Fxvf 2.txt 1.txt; grep -Fxvf 1.txt 2.txt

Is there some reason why you would expect that:
Code:
grep -Fxf 2.txt 1.txt

and:
Code:
grep -Fxf 1.txt 2.txt

would produce different output (other than the order of matching lines found)? These commands both print lines that are present in both files. Why would lines that are found in 1.txt and found in 2.txt be different from lines that are found in 2.txt and found in 1.txt.
 

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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)
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