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Full Discussion: Problem with Recursive function
Top Forums Shell Programming and Scripting Problem with Recursive function Post 302105613 by hegemaro on Saturday 3rd of February 2007 09:24:55 AM
Old 02-03-2007
CPU & Memory
zazzybob's solution is an elegant and simple solution.

In response to recursion within a Korn shell function, there are two points to consider. All variables, including the current working directory, are global unless specifically defined with the function which then makes them local within the function.
Code:
typeset FILENAME=/etc/hosts

Function ()
{
    FILENAME=/etc/resolv.conf
    echo $FILENAME
}

echo $FILENAME
Function
echo $FILENAME

would produce

/etc/hosts
/etc/resolv.conf
/etc/resolv.conf

However,

Code:
typeset FILENAME=/etc/hosts

Function ()
{
    typeset FILENAME

    FILENAME=/etc/resolv.conf
    echo $FILENAME
}

echo $FILENAME
Function
echo $FILENAME

would produce
/etc/hosts
/etc/resolv.conf
/etc/hosts

A quick and dirty way to make variables local to the function INCLUDING the working directory is to execute the function in its own shell by placing parenthesis within the function brackets. The function will get its own copy of the environment when called and any changes, including the directory, to that environment will not be reflected in the calling script which is its own function.

Code:
typeset FILENAME=/etc/hosts

Function ()
{ (
    FILENAME=/resolv.conf
    echo $FILENAME
) }

echo $FILENAME
Function
echo $FILENAME

would produce
/etc/hosts
/etc/resolv.conf
/etc/hosts
Last edited by hegemaro; 02-03-2007 at 10:41 AM..
 

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LEARN ABOUT DEBIAN

gcstar

GCSTAR(1)							Linux User's Manual							 GCSTAR(1)

NAME

       GCstar - Personal collection manager

SYNOPSIS

       gcstar [-u UPDATE-OPTIONS] [-x EXECUTE-OPTIONS] [FILENAME]

DESCRIPTION

       GCstar is a Gtk2 program used to manage personal collections.

OPTIONS

       Without any option, it will open FILENAME if specified or the previously opened file. There are also two groups of options.

   UPDATE-OPTIONS
       -u, --update
	      Tell GCstar to look for available updates

       -a, --all
	      Update all components

       -c, --collection
	      Update collection models

       -w, --website
	      Update plugins to download information

       -i, --import
	      Update plugins to import data

       -e, --export
	      Update plugins to export data

       -l, --lang
	      Update translations

       -n, --noproxy
	      Don't ask for a proxy

   EXECUTE-OPTIONS
       -x, --execute
	      Enter non-interactive mode

       -c, --collection MODEL
	      Specify the collection type

       -w, --website PLUGIN
	      Specify the plugin to use to download information

       -i, --import PLUGIN
	      Specify the plugin to use to import a collection

       -e, --export PLUGIN
	      Specify the plugin to use to export the collection

       -f, --fields FILENAME
	      File containing fields list to use for import/export

       -o, --output FILENAME
	      Write output in FILENAME instead of standard output

       --download TITLE
	      Search for the item with TITLE as name

       --importprefs PREFERENCES
	      Preferences for the import plugin

       --exportprefs PREFERENCES
	      Preferences for the export plugin

       Preferences for import/export plugins are specified using this schema
	      Key1=>Value1,Key2=>Value2

ENVIRONMENT

       HOME   Used to define following variables if needed

       XDG_CONFIG_HOME
	      Where configuration files should be stored. If not defined: $HOME/.config

       XDG_DATA_HOME
	      Where some data will be stored. If not defined: $HOME/.local/share

BUGS REPORTING

       To report bugs, please use this forum:

       http://forums.gcstar.org/viewforum.php?id=4

AUTHORS

       Tian <tian@c-sait.net>

       http://www.gcstar.org/

GCstar								  17 August 2006							 GCSTAR(1)
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