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yum manpage is mentioning yum fssnap command (see below) but no such command is listed in yum --help. 

# yum --help | grep fssnap
fssnapshot     Creates filesystem snapshots, or lists/deletes current snapshots.

It seems that both commands work the same way (aliases?) but 
current manpage description is confusing since it suggest sometimes use fssnapshot and sometimes fssnap.

yum-3.4.3-124.el7.noarch

------------------------

       fssnapshot
              This command has a few sub-commands to act on the LVM data of the host, to list snapshots and
              the  create  and remove them. The simplest commands, to display information about the config‐
              ured LVM snapshotable devices, are:

               yum fssnapshot [summary]
               yum fssnapshot list
               yum fssnapshot have-space

              then you can create and delete snapshots using:

               yum fssnap create
               yum fssnap delete <device(s)>

--------------------------------

Correct, these two are just aliases for the same command.  We'll fix the man page.

Upstream PR:
https://github.com/rpm-software-management/yum/pull/6

Since the problem described in this bug report should be
resolved in a recent advisory, it has been closed with a
resolution of ERRATA.

For information on the advisory, and where to find the updated
files, follow the link below.

If the solution does not work for you, open a new bug report.

https://rhn.redhat.com/errata/RHBA-2016-2397.html