[plone@bn-pandora scripts]$ ls /zope/backup/ | grep -E "*\.fs(\.gz)?$"
2007-06-12-20-21-36.fs
2007-06-12-20-21-37.fs
2007-06-12-20-21-38.fs.gz
[plone@bn-pandora scripts]$ find /zope/backup/ -name "*\.fs(\.gz)?$"
[plone@bn-pandora scripts]$ find /zope/backup/ -name "*\.fs"
/zope/backup/2007-06-12-20-21-36.fs
/zope/backup/2007-06-12-20-21-37.fs
[plone@bn-pandora scripts]$ find /zope/backup/ -name "*\.fs$"
[plone@bn-pandora scripts]$ find /zope/backup/ -name "*\.fs(\.gz)?"
[plone@bn-pandora scripts]$