Shell Programming and Scripting

File1 - input_file
-----
tmp_value|3|number||
tmp_value1|3|alpha||
tmp_value2|6|alpha|AA AA|
tmp_value3|15|number|000000005|
tmp_value4|15|number|000000000000000|
tmp_value5|11|alpha|bbbbbbbbbbb|
tmp_value6|11|alpha|bb bb|
input_file  definition
-------------------
column1 = field_name
column2= field_length
column3= datatype
column4=value for the field
File2 - description_file
-----
tmp_value2|1|1|6|alpha|
tmp_value4|2|7|15|number|
tmp_value1|3|22|3|alpha|
tmp_value3|15|25|15|number|
reserved1|5|40|10|alpha|
filler1|6|50|6|number|
tmp_value6|7|56|11|alpha|
description_file definition
----------------------
column1 = field_name
column2= s1.no
column3= offset
column4=field_length
column5=datatype
fillers can be = fillers1 ...filler<n>
reserved can be = reserved1... reserved<n>

Total length of string can be 6+15+3+15+10+6+11 =66 
The resulted inputstring needed as per description_file is
|AA AA 000000000000000   000000000000005          000000bb bb      |
Description of above result
tmp_value2|1|1|6|alpha| ------------> value is |AA AA | (spaces for remaining 1 character)
tmp_value4|2|7|15|number| ----------> value is  |000000000000000|  samelength so subsitituted as same
tmp_value1|3|22|3|alpha|  ----------> value is  |   | - it is empty in input_file so subsituted spaces
tmp_value3|15|25|15|number| --------> value is |000000005| - filled remaining zero's leading
reserved1|5|40|10|alpha| ------------> value is |          | - it is reserved with alpha as datatype so subsituted spaces
filler1|6|50|6|number| --------------> value is |000000| - it is filler with number as datatype so subsituted zero's
tmp_value6|7|56|11|alpha|-----------> value is |bb bb      | - (spaces for remaining 6 character)

Conditions are:
1)I need to loop thru description file each line with each line in input_file.
2)if column1 in both file r equals then i need to take the value of column4 in input_file and have it in a string.
3)For the above there r certain conditions
 if column1=column1 
  then take column4 of input_filevalue 
  if column4 of input_file value length equals length =column4(field_length) of description_file
   result=result+column4(field_value)
  if column4(field_value) length is not equal to field_length
   if column5(datatype) = number
    fill leading zero's to the value to make to that field_length
    then
     result=result+value
   if column5(datatype) = alpha
    fill trailing spaces to value  to make to that field_length
    then
     result=result+value
 if column1(description_file) not present in input_file
  if column5(datatype) = number
  then
  fill zero's to the value to make to that field_length
  result=result+value
  if column5(datatype) = alpha
  then
  fill spaces to value  to make to that field_length
  result=result+value
 if column1(description_file) has string reserved or filler
  if column5(datatype) = number
  then
  fill zero's to the value to make to that field_length
  result=result+value
  if column5(datatype) = alpha
  then
  fill spaces to value  to make to that field_length
  result=result+value