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Full Discussion: Converting rows to column
Top Forums Shell Programming and Scripting Converting rows to column Post 302634399 by rbatte1 on Thursday 3rd of May 2012 09:44:36 AM
Old 05-03-2012
You statement of
Code:
echo "$a, \c" >>sample.txt

...would actually generate a comma&space separated file. I presume you mean:-
Code:
echo "$a,\c" >>sample.txt

followed by a plain echo at the end of the process.


Anyway, this indirect phrase I used.

If you are using ksh, then the arrays are limited to being one dimensional, i.e. you can only specify one ordinate. If you could specify two, then this would be easier. The logic would work that if you had arrays A and gave them ordinates x & y in a reference that identified a single value as A[x,y] then we could load the array by using a pair of loops like this (not runnable code)
Code:
x=1
y=1

until [ $x -ge 15 ]
do
   until [ $y -gt 15 ]
   do
      {read value into A[$x,$y]}
      {increment y}
   done
   {increment x}
done

Then you could write the data out again looping the other way around, such as:-
Code:
x=1
y=1

until [ $y -ge 15 ]
do
   until [ $x -gt 15 ]
   do
      {write value from A[$x,$y]}
      {increment x}
   done
   {increment y}
done


If your shell does not support two diminsional arrays (such as ksh need to check ksh93) we may have to be more inventive. The indirect variable would be a way of trying to use a variable as a variable name, so you make one of the ordinates part of the variable, so if the 2D array is A you would actually define a set of 1D arrays, A1, A2, A3, A4, ...... for as many values of x as you would have. You could then refer to $A3[5] as being array cell 3,5 as it were. The trick is how to get the array name as a variable. It could get messy.

It depends how one would write something like:-
Code:
echo "${A$x[$y]}"

.... which I'm not sure how to code up.

I'm not sure if this helps, but it may bring further suggestions - and I may learn something too!



Robin
Liverpool/Blackburn
UK
 

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LEARN ABOUT SUSE

openvt

OPENVT(1)							     Linux 1.x								 OPENVT(1)

NAME

       openvt - start a program on a new virtual terminal (VT).

SYNOPSIS

       openvt [-c vtnumber] [-s] [-u] [-l] [-v] [--] command command_options

DESCRIPTION

       openvt  will  find the first available VT, and run on it the given command with the given command options, standard input, output and error
       are directed to that terminal. The current search path ($PATH) is used to find the requested command. If no command is specified  then  the
       environment variable $SHELL is used.

   OPTIONS
       -c vtnumber
	      Use the given VT number and not the first available. Note you must have write access to the supplied VT for this to work.

       -e     Directly execute the given command, without forking.  This option is meant for use in /etc/inittab.

       -s     Switch to the new VT when starting the command. The VT of the new command will be made the new current VT.

       -u     Figure out the owner of the current VT, and run login as that user.  Suitable to be called by init. Shouldn't be used with -c or -l.

       -l     Make the command a login shell. A - is prepended to the name of the command to be executed.

       -v     Be a bit more verbose.

       -w     wait  for command to complete. If -w and -s are used together then openvt will switch back to the controlling terminal when the com-
	      mand completes.

       --     end of options to openvt.

NOTE

       If openvt is compiled with a POSIX (GNU) getopt() and you wish to set options to the command to be run, then you must  supply  the  end	of
       options -- flag before the command.

EXAMPLES

       openvt can be used to start a shell on the next free VT, by using the command:

       openvt bash

       To start the shell as a login shell, use:

       openvt -l bash

       To get a long listing you must supply the -- separator:

       openvt -- ls -l

HISTORY

       Earlier, openvt was called open.  It was written by Jon Tombs <jon@gtex02.us.es or jon@robots.ox.ac.uk>.  The -w idea is from "sam".

SEE ALSO

       chvt(1), doshell(8), login(1)

19 Jul 1996							       V1.4								 OPENVT(1)
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