This happened to me by excecuting octave in the root directory 
$cd ~
~$octave 
octave:1>help help

`help' is a function from the file /usr/share/octave/3.2.4/m/help/help.m

 -- Command: help NAME
     Display the help text for NAME.  If invoked without any arguments,
     `help' prints a list of all the available operators and functions.

     For example, the command `help help' prints a short message
     describing the `help' command.

     The help command can give you information about operators, but not
     the comma and semicolons that are used as command separators.  To
     get help for those, you must type `help comma' or `help semicolon'.

     See also: doc, lookfor, which


Additional help for built-in functions and operators is
available in the on-line version of the manual.  Use the command
`doc <topic>' to search the manual index.

Help and information about Octave is also available on the WWW
at http://www.octave.org and via the [email protected]
:

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https://bugs.launchpad.net/bugs/705891

Title:
  help command fails due to __makeinfo__.m issue

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