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Top Forums UNIX for Advanced & Expert Users Problem with sort +4 Post 302520768 by zaxxon on Monday 9th of May 2011 06:42:26 AM

Old

05-09-2011

Registered User

I added some more lines in the example; sorting starts for the 1st 3 characters of field 4, then continues with the 4th to 6th character. Not sure if this is what you are looking for but you can see how it works.

Code:

$> cat infile
16 Feb 02:49 s_A123_ctas_log.20100216024000.bin
26 Feb 02:55 s_B123_ctas_log.20100226024000.bin
05 Mar 05:22 s_A127_ctas_log.20100305024000.bin
05 Mar 05:22 b_A527_ctas_log.20100305024000.bin
05 Mar 05:22 s_A027_ctas_log.20100305024000.bin
$> sort -t" " -k 4.1,4.3 -k 4.4n,4.6n infile
05 Mar 05:22 b_A527_ctas_log.20100305024000.bin
05 Mar 05:22 s_A027_ctas_log.20100305024000.bin
16 Feb 02:49 s_A123_ctas_log.20100216024000.bin
05 Mar 05:22 s_A127_ctas_log.20100305024000.bin
26 Feb 02:55 s_B123_ctas_log.20100226024000.bin

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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)