Re: [gentoo-user] OT: shell question, maybe xargs?

[Alexander Kapshuk]

On Fri, Mar 10, 2017 at 10:08 AM, Alexander Kapshuk
<alexander.kapshuk@×××××.com> wrote:
> On Fri, Mar 10, 2017 at 5:05 AM, Adam Carter <adamcarter3@×××××.com> wrote:
>> I have one command that dumps out a number of lines of output, and i want to
>> have another command run multiple times taking a single line contents as its
>> argument(s) each time. From what i understand of xargs it takes all the
>> piped input and runs a command once with each of the piped inputs as another
>> argument.
>>
>> Eg. say i want to run ethtool against each active interface dumped out by;
>> ifconfig | grep ^[a-zA-Z] | awk '{print $1}'
>>
>> Tnx
>>
>
> As an alternative solution, you could generate the commands to run like so:
>
> ifconfig | awk -F: '$1 ~ /^[a-zA-z]/ { print "ethtool", $1 }'
>
> And then, either pipe the output of the command line above to sh, or
> do this within the awk's print statement like so:
>
> ifconfig | awk -F: '$1 ~ /^[a-zA-z]/ { print "ethtool", $1 | "sh" }'
>
> Or like so:
>
> ifconfig | awk -F: '$1 ~ /^[a-zA-z]/ { system("ethtool", $1) }'

The last comand line should not have a comma in args to system():

ifconfig | awk -F: '$1 ~ /^[a-zA-z]/ { system("ethtool " $1) }'