02-26-2009
If the tool you have is the only way you can process Excel files from your working environment, then it seems like it's not possible to concat them, since they're in binary format, and concatenating them will make the file either unusable to the ETL tool, or it will only read the first file and stop at the first end-of-file indicator.
However, is there any chance that you can get at the output of your ETL app, and concatenate the output of the three files before they're moved on to the next step?
If you can somehow get the XLS files converted to CSV and combine them before processing then you might be able to pull it off -- I'm sure your ETL tool can process a CSV file as an Excel spreadsheet if it can read the XLS format. There are Unix tools that can read XLS and export them as comma-delimited or tab-delimited files, such as the abtab (abstract table) utilities. I used them for two years at my old job.
abtab - Google Code (I don't know how up-to-date the Google Code files are compared to the in-house version I was using, but it should work.)
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GSF(1) GNOME GSF(1)
NAME
gsf - archiving utility using the G Structured File library
SYNOPSIS
gsf [OPTION...] SUBCOMMAND ARCHIVE...
DESCRIPTION
This manual page briefly documents the gsf command.
gsf is a simple archive utility, somewhat similar to tar(1). It operates on files following one of the structured file formats understood
by the G Structured File library, for example, Microsoft Excel(TM) files.
OPTIONS
Options
-?, --help
Show help options
-v, --version
Display gsf's version
Subcommands
cat Output one or more files in archive
dump Dump one or more files in archive as formatted hexadecimal
help List subcommands
list List files in archive
props Archive list of property names
EXAMPLES
To list the content structure of a Microsoft Excel(TM) file arrays.xls:
gsf list arrays.xls
To dump Workbook, an individual data stream in arrays.xls:
gsf dump arrays.xls Workbook
AUTHORS
gsf's primary authors are Morten Welinder <terra@gnome.org> and Jody Goldberg <jody@gnome.org>.
The initial version of this manpage was written by J.H.M. Dassen (Ray) <jdassen@debian.org>.
SEE ALSO
gnumeric(1)
The Gnumeric homepage <http://www.gnome.org/projects/gnumeric/>
The GNOME project page <http://www.gnome.org/>
gsf 29 November 2009 GSF(1)