OpenBSD doesn't understand the XXXXXX.keyringer format.
According to POSIX.1, the six Xs must be at the end of the template.
Signed-off-by: Silvio Rhatto <rhatto@riseup.net>
gshred(1) is shred(1) from GNU coreutils on OpenBSD
rm(1) on OpenBSD
-P Overwrite regular files before deleting them. Files are
overwritten once with a random pattern. Files with multiple
links will be unlinked but not overwritten.