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Michael Yep wrote:
> Is there a way to have xargs or perhaps another tool take a list
> from stdin and put it somewhere besides the last argument?
>
> Say if i want to get all the offending IPs (bad logins) for a given
> day then i want to take that list and see if its in a file called
> blacklist
>
> lastb -ai |fgrep "Jul 18" |awk '{print $10 }'|sort|uniq | xargs grep
> ??? blacklist
>
> where ??? would be where the stdin goes
Using xargs you could use -I{}, e.g.
lastb -ai | ... | xargs -I{} grep {} blacklist
(You could also replace the pipe to uniq with the -u option to sort.)
Another approach that springs to mind is using a small loop in your
shell. With bash it could be this:
for ip in $(lastb -ai |fgrep "Jul 18" |awk '{print $10 }'|sort -u); do
grep $ip blacklist
done
If you're unsure whether the output may contain spaces, then a while
loop may be easier to cope with than changing $IFS.
lastb -ai | ... |sort -u | while read ip; do
grep "$ip" blacklist
done
- --
Todd OpenPGP -> KeyID: 0xD654075A | URL: www.pobox.com/~tmz/pgp
======================================================================
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