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Full Discussion: Reading multiple variables in a loop
Top Forums UNIX for Dummies Questions & Answers Reading multiple variables in a loop Post 302953334 by bakunin on Thursday 27th of August 2015 05:49:08 AM
Old 08-27-2015
Quote:
Originally Posted by shash
Thanks bakunin. The issue is the variable will be in the following format:
Why? If it is a variable you can define it in any way you want, no?

Or is it some external input you need to use? In this case: how did it get into this variable? Perhaps there is a better way to put it in more suitably formed variables. You might want to present the whole problem, not just an arbitrary part of it.

Quote:
Originally Posted by shash
Code:
table_name=table1,table2,table3
col_name=col1,col2,col3

In this case how to use the array please?
The following is not pretty and less readable than my original idea, but there you go:

Code:
#! /bin/ksh

table_name="table1,table2,table3"
col_name=col1,col2,col3
table=""
col=""

while [ "$table_name" != "" ] ; do
     table="${table_name%%,*}"
     col="${col_name%%,*}"

     echo "TABLE: $table    COL: $col"

     table_name="${table_name##${table}}"
     col_name="${col_name##${col}}"
     table_name="${table_name##,}"
     col_name="${col_name##,}"
done

I hope this helps.

bakunin
This User Gave Thanks to bakunin For This Post:
shash
 

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LEARN ABOUT V7

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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