ecryptfs-add-passphrase man page
ecryptfs-add-passphrase — 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.
This manpage was written by Dustin Kirkland <email@example.com> 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.