Because there will be many webapps I need to build (hence many subdirectory other than "Test"). I've tried to modified the following httpd.conf entry: 
#ScriptAlias /cgi-bin/ "/usr/local/apache/cgi-bin/"

# into 
ScriptAlias /cgi-bin/ "/usr/local/apache/htdocs/cgi-bin/

[download]

Note that there's the ending quote missing. But this modification would allow you to access scripts in /usr/local/apache/htdocs/cgi-bin/hello.cgi as 

http://bioinfo-z.comp.nus.edu.sg/cgi-bin/hello.cgi

[download]

Try 

ScriptAlias /Test/cgi-bin/   /usr/local/apache/htdocs/Test/cgi-bin/
ScriptAlias /Webap1/cgi-bin/ /usr/local/apache/htdocs/Webap1/cgi-bin/
ScriptAlias /Webap2/cgi-bin/ /usr/local/apache/htdocs/Webap2/cgi-bin/

[download]

inside your <IfModule alias_module></IfModule> block.

You could also omit the cgi-bin part 

ScriptAlias /Test/   /usr/local/apache/htdocs/Test/cgi-bin/
ScriptAlias /Webap1/ /usr/local/apache/htdocs/Webap1/cgi-bin/
ScriptAlias /Webap2/ /usr/local/apache/htdocs/Webap2/cgi-bin/

[download]

to access e.g /usr/local/apache/htdocs/Webap1/cgi-bin/hello.cgi as 

http://bioinfo-z.comp.nus.edu.sg/Webap1/hello.cgi

[download]

--shmem 

_($_=" "x(1<<5)."?\n".q·/)Oo.  G°\        /
                              /\_¯/(q    /
----------------------------  \__(m.====·.(_("always off the crowd"))."·
");sub _{s./.($e="'Itrs `mnsgdq Gdbj O`qkdq")=~y/"-y/#-z/;$e.e && print}

In reply to Re^3: Enabling CGI Script from Apache's htdocs directory by shmem
in thread Enabling CGI Script from Apache's htdocs directory by monkfan

Title:
Use:  <p> text here (a paragraph) </p>
and:  <code> code here </code>
to format your post, it's "PerlMonks-approved HTML":


  • Posts are HTML formatted. Put <p> </p> tags around your paragraphs. Put <code> </code> tags around your code and data!
  • Titles consisting of a single word are discouraged, and in most cases are disallowed outright.
  • Read Where should I post X? if you're not absolutely sure you're posting in the right place.
  • Please read these before you post! —
  • Posts may use any of the Perl Monks Approved HTML tags:
    a, abbr, b, big, blockquote, br, caption, center, col, colgroup, dd, del, details, div, dl, dt, em, font, h1, h2, h3, h4, h5, h6, hr, i, ins, li, ol, p, pre, readmore, small, span, spoiler, strike, strong, sub, summary, sup, table, tbody, td, tfoot, th, thead, tr, tt, u, ul, wbr
  • You may need to use entities for some characters, as follows. (Exception: Within code tags, you can put the characters literally.)
            For:     Use:
    & &amp;
    < &lt;
    > &gt;
    [ &#91;
    ] &#93;
  • Link using PerlMonks shortcuts! What shortcuts can I use for linking?
  • See Writeup Formatting Tips and other pages linked from there for more info.