Check out SQL Workbench/J: http://www.sql-workbench.net
It's Java/JDBC based an works well under *nix

It can be run in GUI, console or batch mode and has an extension to SQL that allows to upload the content of a file into a clob or blob column:

insert into some_table (id, blob_column)
values
(42, {$blobfile=/path/to/picture.png});

--- In firebird-support@yahoogroups.com, Marcin Bury <mbury@...> wrote:
>
> Hello
>
> Does someone know a linux command tool that can load a file into a blob
> column?
>
> TIA
> Marcin
>