>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