This line determines whether the user will be able to use the compress command on files:
The yes|no parameter toggles the permission on or off, and classglob is a regular express string that specifies one or more defined classes of users. The conversions that result from the use of this command are specified in the ftpconversions file, which contains directions on what compression or extraction command is to be used on a file with a specific extension, such as .z for the compress command, .gz for the gunzip command, and so on. See the section "Configure FTP Server File-Conversion Actions " later in this chapter.
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