EMBOSS will by default install the data files (including those installed with Rebaseextract, Prosextract Printsextract Aaindexextract or Cutgsextract) in the default directory
share/EMBOSS/datain the install prefix directory. If EMBOSS is not installed (for example, your own personal installation) the data files are written to
emboss/datain the directory where emboss was built.
If you want to place your data files elsewhere, or have a separate set of datafiles you wish to use, you can set the
emboss.defaultor, for personal use, in your