Thanks you both for responding.

I will explain the usage of configuration file from CA.pl.

CA.pl is calling LED.cfg configuration file to check the server name. If it is Development server, CA.pl will look for dev_lcd in LED.cfg config file and use App.ID & User to connect to cyberark server. _lcd is just a notation used to connect to respective server development, test, production. 
LED.cfg
dev_lcd
AppID=APTC_RDFG
User=AB12345

tst_lcd
AppID=APTC_RERF
User=AB45678

pro_lcd
AppID=APTC_RDHF
User=AB98765

[download]
my AppID = $LED.cfg->param( $pillar . "_lcd.AppID);

AppID=AppID configured in cyberark
LED.cfg = configuration file where all server AppID and user names are
+ stored
param = calling the AppID from LED.cfg using _lcd syntax and assign to
+ $AppID
pillar = searches the server if belongs to development or test or prod
+uction. if $pillar is development, dev_lcd is connected and AppID und
+er dev_lcd is assigned to $AppID.

[download]
If there is any other way to assign the variable from LED.cfg to $AppID and $user, please let me know. I can follow the same. I am very new to perl and using this method by taking reference from very old existing script.

Once CA.pl fetches the correct AppID and User based on pillar(dev/tst/prod servers), it will connect to cyberark and provides the password. I am getting the password successfully if i run the script manually. But output of this CA.pl is used to connect to database of another perl main script. I tried many methods to retrieve the password but i failed with undef error as mentioned. 

my $pwd = qx($path/CA.pl);
my $pwd = qx("$path/CA.pl");
my $pwd = system($path/CA.pl);
my $pwd = system('$path/CA.pl');
my $pwd = system('usr/local/bin/perl -w $path/CA.pl');

[download]
Can someone help me on this.

In reply to Re^6: How to call particular parameter from another configuration file in perl by Prakee
in thread How to call particular parameter from another configuration file in perl by Prakee

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