On my systems I have the /etc/snmp/hosts/ directory which contains files 
that look like:

10.11.12.13.conf

and each file then contains:

defVersion 3
defSecurityName v3user
defSecurityLevel authPriv
defAuthType SHA
defAuthPassphrase "My Super SHA Secret"
defPrivType AES
defPrivPassphrase "My AES secret words"

so all I have to issue is:

snmpwalk 10.11.12.13 {whatever OID I need}

Does that help?

BTW - with carefull use of groups and users these files can be locked down 
with very strong permission based security.

I run PakSecured so not certain where Ubuntu places the config files. Try 
man snmp_config

On Tue, 17 Feb 2015, John Morton wrote:

> With regards to running native SNMPWALK from an Ubuntu server, and trying to 
> use the following string:
>
> snmpwalk -v 3 -u ******* -a SHA -A f&hDbv*(g-q4 -x AES -X ******** XX.XX.XX.XX
>
> the underlined password stops the command completing, I assume because of one 
> of the special characters contained within.
>
> Is there a way to encapsulate this password, so I can use it in the string? 
> Or a way to call an external file with the credentials within it when I do 
> the SNMPWALK?
>
> Cheers,
>
> JOHN MORTON
> System Network Engineer

--------------------------------------------------
Matthew G. Marsh,  President
Paktronix Systems LLC
1602 North 59th Street
Omaha  NE  68104-4832
Phone: (402) 932-7250
Email: pa...@paktronix.com
WWW:  http://www.paktronix.com
--------------------------------------------------

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