If you are updating an existing A-Shell installation, you should follow the same process as for an original installation. Under all operating systems, the installation process will detect that (or ask if) an update is being performed and will not overwrite any existing configuration files. Any configuration files that might have new fields added, or differing formats, are stored in example form with .new extensions. If the function key translation tables are updated, the original ones will be saved with .ifs (.ifx) and .vus (.vux) extensions.
The ash_install script used for installing and updating A-Shell under UNIX will execute two special customization scripts—pre_ash_install and post_ash_install—if they exist in the custom subdirectory of the specified target directory tree. These allow you to customize the update process, perhaps saving, renaming, or removing certain commands or files, etc. See the sample scripts included with the release for further notes and examples.
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