Whenever editing the FTP server files, make a backup file first. Also, it is always a good idea to comment out (using a pound sign at the beginning of a line) what is changed instead of deleting or overwriting entries. Follow these comments with a brief description why the change was made. This leaves a nice audit trail of what was done, by whom, when, and why. If you have any problems with the configuration, these comments and details will help you troubleshoot and return to valid entries if necessary. You can use the dpkg command or other Linux tools (such as mc) to extract a fresh copy of a configuration file from the software's package archive. Be aware, however, that the extracted version will replace the current version and overwrite your configuration changes.
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