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Full Discussion: help in my simple script
Top Forums Shell Programming and Scripting help in my simple script Post 302353404 by rwuerth on Tuesday 15th of September 2009 09:22:11 AM
Old 09-15-2009
trying a fix to your code I came up with the following:
Code:
#!/bin/sh
result=`cat file | tr '011' ' '| cut -f 2 -d' '`
for x in $result
do
if [ $x -gt 1 ]
then
        grep "  $x" file
fi
done

I got rid of the 'exit' as you won't process anything after a value that is less than or equal to 1 otherwise. I added the name of the file to the 'grep' command so it knew where to search for the match, and I added a 'tr' command to change the tab to a space and then cut get's a '-d' switch to separate the fields on that space.
This assumes you have only one tab separating the columns of data, and seems to work for me.
However, I would rewrite it like the following, so as to process this with one step inside a loop:
Code:
#!/bin/sh
while read c1 c2 
do
if [ $c2 -gt 1 ]
then
     printf "%s\t%s\n" $c1 $c2 
fi
done < file

Using a while loop to loop through the file, the read command separates the output into two variables. Test the second variable, and if the criteria is met, just reconstruct the known format of the file with a printf statement, rather than greping the original file.
Caveat: I don't have access to 'bash' but I do have access to a bourne shell, so I used that. Probably shouldn't make a difference in this code.
Last edited by rwuerth; 09-15-2009 at 11:35 AM.. Reason: correct some blatant spelling errors
 

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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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