Here are two tiny utilities, pty and timestamplines.
In concert, they allow you to timestamp the output of an arbitrary command like so:
$ pty some-command | timestamplinesor
$ pty some-command | timestamplines -f > log &
$ tail -f log- pty
-
Run a script so that it thinks it is is connected to a terminal, and therefore flushes its output after every line. It solves the "line buffering problem".
- timestamplines
-
Print all lines on STDIN to STDOUT but prepend a time stamp.
- slowprint
-
Also provided is slowprint to test it