current shell

Shell Programming and Scripting
1

how to use the variable in the current process. thought i say export, i willl not be available in the current shell.
so how to run the shell in such a way that varible is available

2

If i understand your problem correctly and assuming your shell is
k shell

Please look at the following example

$ cat x.sh
export a="hello"
echo $a
$ unset a
$ echo $a

$ cat x.sh
export a="hello"
echo $a
$ ./x.sh  
hello
$ echo $a

$ . ./x.sh
hello
$ echo $a
hello
3

Thank u so much, this is what i want.
I also want to know if there is an operator << in unix and what does it do.

4

Yes, it's used for Here Documents.

Check this out from the Advanced Bash Scripting Guide - most of the features will apply for other Bourne-family shells, but here is some Korn Shell specific information.

Cheers
ZB