nspatch - run `nsdiff | nsupdate` with error handling

       The nspatch utility runs `"nsdiff | nsupdate"` and checks that both programs complete successfully. It
       suppresses their output unless there is an error, in a manner suitable for running from cron.

       The nsupdate script produced by nsdiff includes a prerequisite check to detect and fail if there is a
       concurrent update. These failures are detected by nspatch which retries the update.

       Rather than using a pipe, nspatch uses temporary files to store the output of nsdiff and nsupdate.

       "TMPDIR"
           Location for temporary files.

       The nspatch utility returns 0 if no change is required or if the update is successful, or 1 if  there  is
       an error.

       nspatch - run `nsdiff | nsupdate` with error handling

-h  Display this documentation.

       -V  Display version information.

       -rcount
           If the update fails because of a concurrent update, nspatch will retry up to count times. The default
           retry count is 2.

       -v  Turn  on verbose mode, so the output from nsdiff and nsupdate is printed even if they are successful.
           (By default it is suppressed.)

           The verbose option is passed on to nsdiff. If nspatch is not given the -v option, it passes the -v''
           option to nsdiff. If nspatch is given the -v option, it passes the -v'qr' option to nsdiff.

nsdiff(1), nsupdate(1), cron(8)

perl v5.38.2                                       2024-04-21                                        NSPATCH(1p)

       nspatch [-hVv] [-rcount]
               -- [nsdiff options] -- [nsupdate options]

         This is nspatch-1.85 <https://dotat.at/prog/nsdiff/>

         Written by Tony Finch <fanf2@cam.ac.uk> <dot@dotat.at>
         at Cambridge University Information Services.
         You may do anything with this. It has no warranty.