I am trying to execute the shell script inside perl script. I am successfully able to execute the shell script if I manually assign the variable named ApID. But I would like to call variable ApID=APXD_IERF outside the script which is in configuration file named LED.cfg 
>my $confdir = $ENV{$CFG_DIR};
>my $conffile = 'LED.cfg';
>my $LEDcfg = "$confdir/$conffile";
>cat /abcd/efgh/LED.cfg
ApID=APXD_IERF
user=MATT
JOBCD=1357

Script coding as below:
>my $ApID = $LEDcfg->param(".ApID") ## passing the parameter ApID from
+ configuration file 

>my $pwd = `(ApID=$ApID $path/CA.sh)`; ## running shell script by ApID
+ parameterized => Failed
>my $pwd = `(ApID=APXD_IERF $path/CA.sh)`; ## running shell script by 
+ApID hardcoded => Succeeded

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In reply to How to call particular parameter from another configuration file in perl by Prakee

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