An XARGS question

[Todd Zullinger]

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Michael Yep wrote:
> That did not seem to work. Is this correct ?
> 
> [root at localhost ~]# lastb -ai |fgrep "Jul 18" |awk '{print $10
> }'|sort|uniq|xargs grep -i {} /root/BLACKLIST
> grep: 222.234.108.77: No such file or directory
> grep: 83.15.73.34: No such file or directory

The -i is misplaced in this example.  You'd want to use it after xargs
instead of after grep for it to do what you want.  (Though you might
also want to use -i with grep to have it search case-insensitively.)

The xargs manpage states that the -i option is deprecated and you
should use -I{} instead.  The {} is a string, you can use what you
wish as the string to the -I option, so a more readable example might
be:

... | xargs -Iip grep ip blacklist

- -- 
Todd        OpenPGP -> KeyID: 0xD654075A | URL: www.pobox.com/~tmz/pgp
======================================================================
If everything seems to be going well, you have obviously overlooked
something.

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