Custom umask
will cause an incorrect permissions for some perl dirs, created during cpan
usage. As result only you will have access to the required perl libraries. It is importan if you wanna to share those libraries with other users. You need set umask
to default value before execute cpan
.
The default mask value is SIWGRP|S_IWOTH (022, write access for the owner only)._ (man umask
)