Thanks Frank, it works well.
How about if now

Code:

[root@]# cat 1.txt
1321631,7770125555555
1321631,888493949494933
1321631,07774560125666
1321631,4560125666
[root@]#

I have an array:

Code:

@prefix=qw(07774,888493,777);

The output should be like:
1321631,777,0125555555
1321631,888493,949494933
1321631,07774,560125666
1321631,,4560125666

So due to the 4th record no prefix in the predefined @prefix, so it is value is null.

I think:

Code:

awk -F, '{print $1,$2 ~ /@prefix/}' OFS="," 1.txt

i know above is wrong, please guide. Thanks
Thanks