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Full Discussion: Bourne Shell and Arrays
Top Forums Shell Programming and Scripting Bourne Shell and Arrays Post 79063 by Unbeliever on Monday 25th of July 2005 07:01:40 AM
Old 07-25-2005
Bourne Shell and Arrays
Hi everyone, first post here so please be gentle :-)

I normally likle to script in Bourne Shell simply for guarenteed compatibility across any system I might run across but this latest problem has me stumped.

Arrays is a rather significant construct missing from sh and after finding a way to 'fudge' them using eval I thought I found the solution to my problem. However I cant seem to get it to work in all circumnstances. I wont go into all the details, I'll just give you a trivial example.

x=0
eval DATA${x}="element$x"
x=`expr $x + 1`
eval DATA${x}="element$x"
x=0
eval echo \$DATA$x
x=`expr $x + 1`
eval echo \$DATA$x

This correct echos "element0" and "element1". However what I cannot get to work is using the eval within a test construct. What I would like to do is this:

if [ "`eval echo \$DATA$x`" = "element0" ]
then
echo element 0 found
fi

but it just doesnt work. the eval works fiune standalone but withing back quotes it doesn't. I am obviously misunderstanding something as to how back quote execution, eval, or possibly both work. So I dont know even if its possible to do this at all.

I've tried all sensible (and not so sensible) combinations of quotationa dn escaping to no avail.

Any help appreciated.

Sean Timmins
 

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LEARN ABOUT OSX

cpanplus::shell

CPANPLUS::Shell(3pm)					 Perl Programmers Reference Guide				      CPANPLUS::Shell(3pm)

NAME

       CPANPLUS::Shell - base class for CPANPLUS shells

SYNOPSIS

	   use CPANPLUS::Shell; 	    # load the shell indicated by your
					    # config -- defaults to
					    # CPANPLUS::Shell::Default

	   use CPANPLUS::Shell qw[Classic]  # load CPANPLUS::Shell::Classic;

	   my $ui      = CPANPLUS::Shell->new();
	   my $name    = $ui->which;	    # Find out what shell you loaded

	   $ui->shell;			    # run the ui shell

DESCRIPTION

       This module is the generic loading (and base class) for all "CPANPLUS" shells. Through this module you can load any installed "CPANPLUS"
       shell.

       Just about all the functionality is provided by the shell that you have loaded, and not by this class (which merely functions as a generic
       loading class), so please consult the documentation of your shell of choice.

BUG REPORTS

       Please report bugs or other issues to <bug-cpanplus@rt.cpan.org<gt>.

AUTHOR

       This module by Jos Boumans <kane@cpan.org>.

COPYRIGHT

       The CPAN++ interface (of which this module is a part of) is copyright (c) 2001 - 2007, Jos Boumans <kane@cpan.org>. All rights reserved.

       This library is free software; you may redistribute and/or modify it under the same terms as Perl itself.

SEE ALSO

       CPANPLUS::Shell::Default, CPANPLUS::Shell::Classic, cpanp

perl v5.16.2							    2012-10-11						      CPANPLUS::Shell(3pm)
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