Show HN: How did I live without Pipe Watch?
Description from man page:<p><pre><code>       pw  stands for Pipe Watch. This is a utility which continuously reads textual input from a
       pipe or pipe-like source, and maintains a dynamic display of  the  most  recently  read  N
       lines.

       If  pw  is invoked such that its standard input is a TTY, it simply reads lines and prints
       them in its characteristic way, with control characters replaced  by  caret  codes,  until
       end-of-file is encountered. Long lines aren&#x27;t clipped, and there is no interactive mode.

       The intended use of pw is that its standard input is a pipe, such as the output of another
       command, or a pipe-like device such as a socket or whatever.  In this  situation,  pw  ex-
       pects  to  be  executed in a TTY session in which a &#x2F;dev&#x2F;tty device can be opened, for the
       purposes of obtaining interactive input.  The remaining description pertains to  this  in-
       teractive mode.

       In  interactive mode, pw simultaneously monitors its standard input for the arrival of new
       data, as well as the TTY for interactive commands.  Lines from standard input  are  placed
       into  a  FIFO  buffer.  While the FIFO buffer is not yet full, lines are displayed immedi-
       ately.  After the FIFO buffer fills up with the specified number of lines  (controlled  by
       the  -n  option)  then  pw transitions into a mode in which, old lines are bumped from the
       tail of the FIFO as new ones are added to the head, and refresh operations are required in
       order to display the current FIFO contents.

       The display only refreshes with the latest FIFO data when

       1.     there is some keyboard activity from the terminal; or

       2.     when the interval period has expired without new input having been seen; or else

       3.     whenever the long period elapses.

       In  other words, while the pipe is spewing, and there is no keyboard input, the display is
       updated infrequently, only according to the long interval.

       The display is also updated when standard input indicates end-of-data.  In this situation,
       pw  terminates, unless the -d (do not quit) option has been specified, in which case it pw
       stays in interactive mode. The the end-of-data status is indicated by the string EOF being
       displayed in the status line after the data.</code></pre>