Oracle script "define variable" prompting for new value because of underscore character

Oracle sqlplus is prompting for a new variable because of an underscore.  Example below.  I want &name to be replaced not prompted for another variable value.

define name="&1"
define filename="c:\temp\&name_additional_info.txt"

SQLPLUS then prompts for a new variable value.

    Enter value for name_additional_info
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ciphersolAuthor Commented:
The underscore or any alphanumeric character will cause a prompt for a new variable.
slightwv (䄆 Netminder) Commented:
Try this:
define filename="c:\temp\&&name._additional_info.txt"

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Bill PrewIT / Software Engineering ConsultantCommented:
You just need to end the referenced variable name with a period (default concatenate operator), so this will work:

define filename="c:\temp\&name._additional_info.txt"

slightwv (䄆 Netminder) Commented:
Here is the doc link for what Myself and Bill posted:
If you wish to append characters immediately after a substitution variable, use a period to separate the variable from the character.
ciphersolAuthor Commented:
Thanks.  That works.
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