Setting: URLM_LOG_FILE (default: ~/.irssi/urllog) [*]

This is where URLs are stored. The file is updated immediately after
each URL is captured, and after any URL(s) are deleted. urlmanager
uses file locking (via flock()), so it's safe to run multiple instances
of irssi with the script loaded.

The log file need not exist when the script is first loaded; it will
be created as soon as the first URL is captured. The directory for the
log file must already exist, though. Tilde expansion (~ meaning home
directory) is supported.

When this setting is changed, the in-memory URL log is cleared and
repopulated from the new file.