verbose mode

Historically, scrolling text "verbose mode" has typically appeared on Linux computers during boot.

Adding the -v parameter to the command runs contig in verbose mode.

OfflineIMAP provides several command-line interfaces, including interactive color curses-based, non-interactive console logging, and several yet less verbose modes.

As long as verbose mode (-v) is enabled, OS detection will usually determine the IP ID sequence generation method and print a line such as "IP ID Sequence Generation: Incremental".