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Full Discussion: Problem with sort-of array in SH
Top Forums UNIX for Dummies Questions & Answers Problem with sort-of array in SH Post 302414022 by onstock on Monday 19th of April 2010 03:38:44 AM
Old 04-19-2010
Problem with sort-of array in SH
Hello to everyone!

I'm really new in shell scripting and I'm experiencing a very odd problem. This is my first post in this forum, hope you can help!

I know that declaring arrays in Bourne Shell is impossible. But this is where I start having problems - system administrator did not install ksh. So after searching some in google, I found an alternative way to declare an array, however I do not know if this is gonna work.

Code:
for i in $*
do
for word in $i
do
echo "$word"
done
done

It reads values from command line and prints them out. I need characters entered in command line to be printed out in one line without spaces and I've done it by myself too:

Code:
echo "Formatted text:"
for var in $*
do
printf "%s$var"
done > "text"
cat text

But what about arrays? Would this work for me? (Found it by googling):

Code:
echo "Enter the line: \c"
read temp
n=0
for word in $temp
do
n=`expr $n + 1`
   eval part$n="$word"
done

All I could achieve was printing out the number of $n which was storing information. Creating another loop below this code trying to take values from part$n or $part$n did not give any results:

Code:
for var in $part$n
do
printf "%s$var"
done

Also, what exactly 'expr' and 'eval' stands for?

Any help would be appreciated,

onstock
Last edited by onstock; 04-19-2010 at 04:48 AM..
 

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LEARN ABOUT REDHAT

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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