Passing values between Bash Shell (Oracle Linux 6.5) and Oracle 11g procedures and functions

This is a long post but bear with me.  It has 3 parts.

I am writing a bash shell script that will load and process a flat file.  

This script needs to be able to :
1. pass single variables from the script to an oracle procedure or function   <----- This I am able to do without issue
2. pass a shell array to an oracle procedure or function                    <----- this I need help with
3. assign a single value to a shell variable FROM a procedure or a function   <----- this I need help with
4. assign a multiple values to a shell array variable FROM a procedure        <----- this I need help with

Challenge 2 -------

if we assume in the file named testfile_20140318_09583200_0004.csv contains 10 lines of which:
1st Line = H,20140318,09583200,0004
10th Line = T,1234567

In my script I have the following snipet of code

#!/bin/bash
myfile='testfile_20140318_09583200_0004.csv'

hdr=`sed '1q;d' $myfile`
trl=`sed '$q;d' $myfile`
arr_hdr=($( echo "$hdr" | awk 'BEGIN{FS=","} { for (i=1; i<=NF; i++) print $i }'))
arr_trl=($( echo "$trl" | awk 'BEGIN{FS=","} { for (i=1; i<=NF; i++) print $i }'))
cnt_hdr_fields=${#arr_hdr[@]}
cnt_trl_fields=${#arr_trl[@]}

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I then want to be able to pass the array variables arr_hdr and arr_trl whether to a procedure or function to do further validation, something like this:

sqlplus -s /nolog << EOF
      SET TIMING OFF SET FEEDBACK OFF SET SERVEROUTPUT ON
      BEGIN
         pkg_file_process.check_hdr_trl(p_hdr => $arr_hdr , p_trl => $arr_trl );
      END;
/
exit;
EOF
}

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I can not get this work.

Challenge 3 -------

Assume my oracle package has another function pkg_file_process.check_filename that returns 0 for success and 1 for failure.  Intent is to validate the parts of the filename against parts of the header record plus other business rules.

I want to capture that return value in a shell variable.

In my script I have the following snipet of code

#!/bin/bash
myfile='testfile_20140318_09583200_0004.csv'

hdr=`sed '1q;d' $myfile`
trl=`sed '$q;d' $myfile`
arr_hdr=($( echo "$hdr" | awk 'BEGIN{FS=","} { for (i=1; i<=NF; i++) print $i }'))
arr_trl=($( echo "$trl" | awk 'BEGIN{FS=","} { for (i=1; i<=NF; i++) print $i }'))
cnt_hdr_fields=${#arr_hdr[@]}
cnt_trl_fields=${#arr_trl[@]}

ret_val=`sqlplus -s /nolog << EOF| grep ^l_status | sed "s/^l_status:= //"
      SET TIMING OFF SET FEEDBACK OFF SET SERVEROUTPUT ON
      DECLARE
         l_status NUMBER;
      BEGIN
         l_status:= pkg_file_process.check_filename(p_filename => '$myfile', p_hdr => '$hdr' );
      END;
/
exit;
EOF`
}
if [ $ret_val -eq 0 ]; then
   echo "File name validates successfully"
else
   echo "File name invalid"
fi 

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I can not get this work.

Challenge 4 -------

I saw this snipet from

http://asktom.oracle.com/pls/asktom/f/f?p=100:11:0%3a%3a%3a%3aP11_QUESTION_ID:430819636473

which apparently returns multiple values to a shell array variable.  

#!/bin/ksh
echo "------------------------------"
echo "using an array..."
echo "------------------------------"
## Max 4095 in Sun OS 5.6!
set -A my_arr `sqlplus -s scott/tiger@dev <<EOF
set pagesize 0 feedback off verify off heading off echo off
SELECT table_name from user_tables where rownum < 4;
exit;
EOF`

echo "there are ${#my_arr[*]} elements in the array"
element=0
while [ $element -lt  ${#my_arr[*]} ]
  do
  echo "==>"${my_arr[$element]}
  let element=$element+1;
done

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I have attempted to get this concept to work in my bash environment for my specific needs but unsuccessfully.  Is it because this is for a ksh shell and certain commands like 'set -A' are not valid in bash shell?

-----

Any assistance on solutions for 2, 3, 4 would be greatly appreciated.