Hi... I m using RHEL5. As by Redhat Linux Positional parameters are from $0 - $9. Is there any way to increase this for ex. $0 - $ 15.
Please give me the file associated with positional parameter.
Thanks in advance.....

You are talking about BASH syntax....it is not specific to RedHat (or any other distro)

There are several good books on BASH---eg "BASH Guide for Beginners" and "The Advanced BASH Scripting Guide"(ABS)---both free at tldp.org. I recommend downloading ABS and using it for searches.

From ABS: $1 - $9 = positional parameters #1-9
${10} = positional parameter #10

I don't know how high you can go ( I tried 13 and it worked)

I don't know what you mean by this--eg documentation (see above). If you mean a file in the OS, then I don't think there is such a thing. The parameters are passed to a command in a memory stack---they would only get into a file if you put them there.

See this page http://www.tldp.org/LDP/abs/html/othertypesv.html
By default the normal limit is 10 params (0-9).
If you want to go beyond that, you can use ${10}, ${11} etc or the old school way, use the 'shift' cmd, see sect 4.7 on that page.