This line is a bit different from the other commands in the permission control section. The umask command determines with what permissions a user can create new files; here it is.
umask <yes|no> <typelist>
The yes|no parameter toggles based on whether a user is allowed to create a file with his default permissions when uploading a file. Like the overwrite command you read about earlier in this section, this command line is specific to uploaded files because the client machine determines how new files are created from a download.
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