addgnupghome (8) - Linux Man Pages
addgnupghome: Create .gnupg home directories
addgnupghome - Create .gnupg home directories
SYNOPSISaddgnupghome account_1 account_2...account_n
DESCRIPTIONIf GnuPG is installed on a system with existing user accounts, it is sometimes required to populate the GnuPG home directory with existing files. Especially a 'trustlist.txt' and a keybox with some initial certificates are often desired. This script helps to do this by copying all files from '/etc/skel/.gnupg' to the home directories of the accounts given on the command line. It takes care not to overwrite existing GnuPG home directories.
addgnupghome is invoked by root as:
addgnupghome account1 account2 ... accountn