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f216be6e75
One part of ftpd user authentication is to check if the user has a so called "standard shell". But, it is no longer obvious what that actually is. The Linux man-pages project uses different names to designate a "standard shell", i.e., "valid login shell" when documenting /etc/shells, "permitted user shells" and "valid user shell" when documenting getusershell(), making it harder to figure this out. Expand ftpd user authentication step 3 by adding information about /etc/shells and getusershell(), and the different names used for "standard shell". * NEWS: Mention ftpd documentation improvement. * doc/inetutils.texi (ftpd invocation): Explain "standard shell" as used in the ftpd authentication rules.