Hi!

The following shall give you some hints:

• Read the second file line-by-line (as you did with file1)
• apply a regular expression to extract the customer-id (and the rest of relevant data); see the fragment below

  $_ =~ /(\d*).*SWITCH\sFastEthernet(\d)/;     # just an example on how 
  +to extract some data
  my $id = $1;                                 # get the iD
  my $switchNr = $2;                           # get the number of the s
  +witch
  [download]

• append the text to the hash (already formatted for the output); you could use sth. like the following code

  $CUST_NAME{$id} .= "\nSWITCH Fa$switchNr ..."; # append the output, al
  +ready formatted
  [download]

• pass through all the keys of the hash and print the values (pretty straightforward)

HTH, Rata