Shell Programming and Scripting

# for a shell variable named 'VAR' the value of '$VAR' is accessed thusly:
$ENV{'VAR'};

#!/bin/bash
tab=$1;
declare -a ${tab}_fld;
for((i=1;i<=4;i++))
do
   echo -n "enter ${tab}_fld[$i] :";read ${tab}_fld[$i];
done

eval echo \${${tab}_fld[3]};

 export  ${tab}_fld;
 export tab;
 perl -e '
   $tab="$ENV{'tab'}"."_fld";
   print ("$tab\n");
  print ("env: $ENV{'"$tab[3]"'} \n");
 '

$ ./sample1.sh hell
enter hell_fld[1] :1
enter hell_fld[2] :2
enter hell_fld[3] :3
enter hell_fld[4] :4
3
syntax error at -e line 4, near "hell["
Execution of -e aborted due to compilation errors.

#!/usr/bin/perl
$tab="$ENV{'tab'}"."_fld";
 print ("$tab\n");
 print ("env: $ENV{'"$tab[3]"'} \n");