script -r is useful for recording time-stamps of when output
happened. With -T, rather than playback the script in real-time
we simply print the time-stamps to show when the output happened.
This is very useful for example, for analyzing boot time activity.
If the fmt provided contains no % characters the default
%n@ %s [%Y-%m-%d %T]
is used, which lends itself to analysis by tools as well as humans.
Sponsored by: Juniper Networks, Inc.