By Matthew M Lavy; Ashley J Meggitt

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Requires No User Intervention It is essential to ensure that the script does not hang around waiting for user input. While this may seem obvious, it is easy to get caught out. * If such eventualities are not foreseen and solutions written in, the script will sit idle, waiting for input that just won’t turn up. * A classic example is the net share command (used to manage shares). If you attempt to create a share with too long a name, it will warn that MS-DOS workstations will be unable to access it and request confirmation that you really want to create it.

Not only is it possible to write a script that takes care of all the script updates on a workstation, but if you understand how a self-updating script works, it is also reasonably straightforward. We call these things stub scripts, and by the end of the chapter, you will know how to write one. * This problem is mitigated substantially if the self-updating code is moved to a general module that can be invoked by all scripts that wish to update themselves (see Chapter 9, A Custom Module). Using a Stub Script 35 Using a Stub Script A stub script uses a very similar mechanism to a self-updating script, but instead of checking its own version number against that of a server-based equivalent, it compares a whole directory of Perl scripts with an equivalent directory on the server.

This involves going through each element that remains in the hash table and deleting the associated file. @deletables = keys(%local_files); foreach $deletable(@deletables) { print "deleting $deletable"; `del $localpath\\$deletable`; } Finally, we go through each script in the local directory, running all the scripts. This involves creating a new array of filenames and running each in turn. pl suffix; hence the regular expression. pl files { `$localpath\\$file`; } } And that is all there is to it.

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