Description of problem:

Yum provides a shell, which is not documented in the manpage or info page.

Version-Release number of selected component (if applicable):
2.3.2-7

How reproducible:
N/A.

Steps to Reproduce:
1. check manpage and search for /shell/.  The only references are to
file-globbing.  No reference to a built-in shell and additional yum commands
available there.
2.
3.
  
Actual results:

Scripts such as yum.cron are confusing if you don't know that yum provides a
shell.  And the commands in yum-daily.yum are foreign unless you know that yum
has a shell with additional commands, such as 'ts run' that are not in the man page.

Expected results:

If yum can do it, it should be documented.  There appears to be some help text
for the yum shell, but it is available only by invoking the shell and using the
help command, which is not the same as the --help option (this is documented).

Additional info:

Currently, the only way to discover this is either to experiment or to locate
release notes or mailing list postings on this topic.

At the very least, the manpage should mention that the command

yum shell

will invoke an internal shell.  The manpage should at least indicate that more
help is available if you try the 'shell' command and type 'help'.