naming variables with variables Post: 302209539

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Top Forums Shell Programming and Scripting naming variables with variables Post 302209539 by Allasso on Friday 27th of June 2008 08:52:49 AM

06-27-2008

Registered User

naming variables with variables

Hello,

FIRST QUESTION:

I am writing a script in which a query is taken at the beginning of the script to be later used at the end. In the query, variables are generated from a loop, and I would like to assign the variable NAME (not value) with an appended 1, 2, 3, 4.....n. The number of loops varies according to the circumstance.

So for example, I get:
$pattern1, $pattern2, $pattern3...etc

The problem I have is that these variables are used later in the script in a loop, in which the first pass of the loop needs to call the first $pattern1, the second pass should call $pattern2, etc.

How do I dynamically call each variable in its sequence?

If I try something like incrementing a variable called "pass" each time, and then appending it to pattern:

$pattern$pass

I merely get the concatenation of the two (which simply is the value of $pass, since $pattern is not set).

I have tried things like:

${pattern$pass}

but only get errors.

Any ideas on how to call variables in this way?

SECOND QUESTION

At the beginning of the script where I am originally assigning values to the $pattern/n variables, I am also naming them dynamically, using

let pattern$pass=value

so when pass=1 I end up with a variable called pattern1 with the value of value.

(simply typing pattern$pass=value does not work, I had to explicitly use the let command.)

This works fine, but I run into trouble when I want to place forward slashes around value in order to substitute it in a sed script, eg,

let pattern$pass=/value/

I get an error from let saying operand expected.

Does anyone know how I might accomplish this?

I can work around this one, but I would rather find out how to do what I want to do.Thank you,

Allasso

Allasso

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LEARN ABOUT OSX

dump

dump(n) 																   dump(n)

__________________________________________________________________________________________________________________________________________________

NAME

       dump - Dump information about Tcl interpreter in TkCon

SYNOPSIS

       dump method ?-nocomplain? ?-filter pattern? ?--? pattern ?pattern ...?

_________________________________________________________________

DESCRIPTION

       The  dump  command  provides  a way for the user to spit out state information about the interpreter in a Tcl readable (and human readable)
       form.  It takes the general form:

       dump method ?-nocomplain? ?-filter pattern? ?--? pattern ?pattern ...?

       The patterns represent glob-style patterns (as in string match pattern $str).  -nocomplain will prevent dump from throwing an error  if	no
       items matched the pattern.  -filter is interpreted as appropriate for the method.  The various methods are:

       dump command args
	      Outputs one or more commands.

       dump procedure args
	      Outputs one or more procs in sourceable form.

       dump variable args
	      Outputs  the values of variables in sourceable form.  Recognizes nested arrays.  The -filter pattern is used as to filter array ele-
	      ment names and is interepreted as a glob pattern (defaults to {*}).  It is passed down for nested arrays.

       dump widget args
	      Outputs one or more widgets by giving their configuration options.  The -filter pattern is used as to filter the config options  and
	      is interpreted as a case insensitive regexp pattern (defaults to {.*}).

SEE ALSO

       idebug(n), observe(n), tkcon(1), tkcon(n), tkconrc(5)

KEYWORDS

       Tk, console, dump

COPYRIGHT

       Copyright (c) Jeffrey Hobbs <jeff at hobbs.org>

TkCon									2.5								   dump(n)

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