add an eCryptfs mount passphrase to the kernel keyring.
printf "%s" "passphrase" | ecryptfs-add-passphrase [--fnek] -
ecryptfs-add-passphrase is a utility to manually add a passphrase to the kernel keyring.
If the --fnek option is specified, the filename encryption key associated with the input passphrase will also be added to the keyring.
ecryptfs(7), keyctl(1) /usr/share/doc/ecryptfs-utils/ecryptfs-faq.html http://ecryptfs.org/
This manpage was written by Dustin Kirkland <firstname.lastname@example.org> for Ubuntu systems (but may be used by others). Permission is granted to copy, distribute and/or modify this document under the terms of the GNU General Public License, Version 2 or any later version published by the Free Software Foundation.
On Debian and Ubuntu systems, the complete text of the GNU General Public License can be found in /usr/share/common-licenses/GPL.