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Full Discussion: Convert list of numbers to text range
Top Forums Shell Programming and Scripting Convert list of numbers to text range Post 302987744 by chrissycc on Friday 16th of December 2016 04:25:48 AM
Old 12-16-2016
Hi RudiC - thanks that is almost perfect.....

The almost comes in as if I have a slightly different dataset where the final number isn't the end of a sequence, it becomes a sequence of its own, e.g.

Input:
Code:
cn001
cn004
cn016
cn017
cn018
cn019
cn020
cn021
cn031
cn032
cn038
cn042
cn043
cn044
cn045
cn048

Output:
Code:
cn[001,004,016-021,031-032,038,042-045,048-048]

I'm guessing I just need to drop an if statement in after END, so I'll have a look at that and report back....

---------- Post updated 16-12-16 at 09:25 AM ---------- Previous update was 15-12-16 at 11:15 AM ----------

Thanks for the help RudiC. My final code which seems to work (I've run it through various test cases):

Code:
awk '
NR == 1         {PFX = substr ($1, 1, match ($1, /[0-9]/)-1)
                 printf "%s[", PFX
                 LEN = length($1) - length(PFX)
                 PRE = -1E9 
                }

                {sub (PFX, "")
                }

$1 == PRE + 1   {SEQ = 1
                }
$1  > PRE + 1   {if (SEQ) printf "-%0*d", LEN, PRE
                 printf "%s%0*d", DL, LEN, $1
                 DL = ","
                 SEQ = 0
                }

                { PREPRE=PRE ; PRE = $1 }
END          { 
                  if ($1 > PREPRE+1) { printf "]\n" }
                  else { printf "-%0*d]\n", LEN, $1 }
                }
' file

 

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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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