UNIX for Dummies Questions & Answers

Hi,
I am having 2 files which are as follows :

File 1
1*001
2*002
3*003
4*004

File2
002
003

I want to match the entries in File 2 against File1.If an entry from File2 is found in File1 then I need to extract the number before "*" (a delimiter)
for example...i pick up 002 from File 2 and I search it in File 1.I see that it is present as a sub string in the entry "2*002".So now I will extract the number 2 present before the delimiter "*"

Note There can't be mulitple occurances of entry from File 2 in File1 that means in the example just taken, there can't be more than one 002.
Can you gurus suggest how is it supposed to be done ?
Thanks and Regards
Tushar Johri

Code:

awk -F'*' 'NR==FNR{a[$0]}(NR!=FNR)&&($2 in a){print $1}' file2 file1

Code:

 awk -vfile=file2 -f script.awk file1 | cut -d"*" -f 1

script.awk

Code:

    BEGIN { while( getline<file) arr[$0]=$0 }
{ 
	for (i in arr) {
	if ( $0 ~ i )
	{
		print $0
	}
}
}

Hi r2007 and bhargav,
As I am new to this jargon of Unix and Shell scripting , please help me figure out how the piece of the code works
Thanks
Tushar

Perhaps use grep instead...

Code:

fgrep -f file2 file1 | cut -d"*" -f 1