like "tail -f", but works on truncated files, directories, more

 xtail watches the growth of files. It's like running a "tail -f" on a bunch
 of files at once. It notices if a file is truncated and starts from the
 beginning. You can specify both filenames and directories on the command
 line. If you specify a directory, it watches all the files in that directory.
 It will notice when new files are created (and start watching them) or when
 old files are deleted (and stop watching them).
 .
 Note that xtail isn't a graphical (X11) program, it runs on a plain tty. The
 name likely comes from "eXtended tail" or such.