watch command throws error about grab_packt

[jrial]

Watch is a standard Linux command, part of the procps package.

From the man page:

OPTIONS
       -d, --differences [permanent]
              Highlight  the  differences between successive updates.  Option will read optional argument that changes highlight to
              be permanent, allowing to see what has changed at least once since first iteration.

       -n, --interval seconds
              Specify update interval.  The command will not allow quicker than 0.1 second interval, in which  the  smaller  values
              are converted.

Not that it still matters; since the captcha on that page, this downloader no longer works. But at least you know what "watch" is now. ;)