feeding a series of input args to a command that only takes one

Icarus Sparry <usenet@icarus.freeuk.com> wrote in news:481ab188$0$34548
$742ec2ed@news.sonic.net:

>
> cmd1 | cmd2 | while read ip ; do ip2hex $ip ; done

Thanks guys for all those leads! I think xargs works perfect. Does my
job. Just out of curiosity though: I haven't been able to hack together
the while read oneliner that would do the same job:

echo "11.0.0.1 \n 11.0.0.2 \n 11.0.0.3" | while read ip ; do ip2hex $ip
; done

Only does the first address. Even tried:

echo "11.0.0.1 11.0.0.2 11.0.0.3" | while read ip ; do ip2hex $ip ;
done

What's the correct form?

--
Rahul

Rahul wrote:
> Icarus Sparry <usenet@icarus.freeuk.com> wrote in news:481ab188$0$34548
> $742ec2ed@news.sonic.net:
>
>> cmd1 | cmd2 | while read ip ; do ip2hex $ip ; done
>
> Thanks guys for all those leads! I think xargs works perfect. Does my
> job. Just out of curiosity though: I haven't been able to hack together
> the while read oneliner that would do the same job:
>
> echo "11.0.0.1 \n 11.0.0.2 \n 11.0.0.3" | while read ip ; do ip2hex $ip
> ; done
>
> Only does the first address. Even tried:
>
> echo "11.0.0.1 11.0.0.2 11.0.0.3" | while read ip ; do ip2hex $ip ;
> done
>
> What's the correct form?

Supply only one IP number per line. The "read" command will read a
complete line on each invocation.

Compare:
kees@lankhmar:~$ echo "11.0.0.1 \n 11.0.0.2 \n 11.0.0.3"
11.0.0.1 \n 11.0.0.2 \n 11.0.0.3
with:
kees@lankhmar:~$ echo -e "11.0.0.1 \n 11.0.0.2 \n 11.0.0.3"
11.0.0.1
11.0.0.2
11.0.0.3


Regards,

Kees.

--
Kees Theunissen.