Open a terminal. Run the following command to make sure you have the packages curl and libreoffice-calc installed:
apt-get install curl libreoffice-calc
Then you can use CURL to convert the Interbase file to CSV. You have to replace example.gdb/ib with the file you want to convert.
curl -F email@example.com/ib https://www.rebasedata.com/api/v1/convert?outputFormat=csv -o output.zip
Now try to open the file output.zip. It will contain CSV files. You can open these CSV files with LibreOffice Calc. Make sure you specify "comma" as column separator.
If you cannot open the file output.zip, there was probably an error and the file contains the error message. Open it with gedit to see the error.
That's it! You successfully read your Interbase file.
The RebaseData PHP client library internally uses our API to convert the Interbase file to a set of CSV files. These CSV files, one per table, will be cached locally to allow fast reads on the second access. In case the input file changes, a new conversion will be triggered.