To clear out FieldWorks settings and data on a Linux test machine, rename or delete directories such as the following. Note that deleting some of these will delete user project data.

• FW registry, ICU overrides, etc.

    ~/.config/fieldworks/registry
    ~/.config/fieldworks/Icu54
    ~/.config/fieldworks
  

• More FW registry

    ~/.mono/registry/CurrentUser/software/sil
  

• LDML, misc.

    ~/.local/share/SIL
  

• Firefox profile for geckofx

    ~/.local/share/Geckofx
  

• FW projects

    ~/.local/share/fieldworks
  

Some of these directories may be used to store settings or data for other software, like WeSay or Pathway (so you may be deleting more than just FieldWorks data and settings).

Directories can be deleting using a command such as

rm -rf DIRECTORY

For example:

rm -rf ~/.config/fieldworks

Another example:

rm -rf ~/.config/fieldworks ~/.mono/registry/CurrentUser/software/sil ~/.local/share/SIL ~/.local/share/Geckofx