_ZO_EXCLUDE_DIRS is a list of paths (separated by colons, `:`, on
Unix-based systems, and semicolons, `;`, on Windows) that should be
excluded from the database. Example:
_ZO_EXCLUDE_DIRS="$HOME:$HOME/something/super/secret:$HOME/caused/by/background/cds"
If the user passes the `--merge` flag to the `migrate` subcommand, all
duplicate entries will have their ranks and epochs updated: the rank
will be the sum of the stored rank and the newly-parsed rank, while the
epoch will be the maximum of the stored epoch and the newly-parsed
epoch.
This allows one to import from the `z` database even after having used
`zoxide` for any amount of time. This also permits a user who has
already sourced the init script to import their old database without
needing to do something like `rm ~/.zo && zoxide migrate ~/.z`.
Cole Helbling
Ajeet D'Souza