Unable to use '-x' with large directories.

[ipsi]

Attempting to use the -x option if the directory contains a large number of files results in the following:

  % Total    % Received % Xferd  Average Speed   Time    Time     Time  Current
                                 Dload  Upload   Total   Spent    Left  Speed
  0     0    0     0    0     0      0      0 --:--:--  0:00:01 --:--:--     02015/06/01 15:49:32 could not run tar: fork/exec /usr/bin/tar: argument list too long

This is probably because the directory has 15,502 files in it. I believe the appropriate solution is to add the option -T - to the tar command, and to send the list of files to add via stdin.