tra \- copy out a file as it grows
will copy out (transcribe) the contents of a file which is growing as it grows.
It alternately copies out the new material in the file and sleeps
can be given to limit the total running time of the
the default is effectively infinite.
normally copies out all the text currently in the file
before beginning to watch for new text.
alone causes only new material to be given.
is particularly useful for alternately watching the output
file being written by a long shell script or a long-running
program and doing real work.