Date: Sun, 4 Oct 2015 23:21:41 -0453.75 From: "William A. Mahaffey III" <wam@hiwaay.net> To: freebsd-questions@freebsd.org Subject: Re: awk question Message-ID: <5611F98B.5060300@hiwaay.net> In-Reply-To: <5611EEE2.9030100@sneakertech.com> References: <5611C922.4050007@hiwaay.net> <5611EEE2.9030100@sneakertech.com>
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On 10/04/15 22:36, Quartz wrote:
> On Oct 4 8:48 PM, William A. Mahaffey III wrote:
>>
>>
>> I am using awk & smartctl in a small shell script to print out HDD temps
>> in a purty format, 1 line per drive. As it happens, the output I want is
>> spread out over 4 lines of smartctl out, requiring (I *think*) 4 calls
>> to smartctl each piped to its own awk invocation to pull out the line I
>> want & print its info out. Is there some way to get awk to consider more
>> than 1 line at a time ? In my case my 4 lines are indeed sequential, &
>> it would be a bit more efficient if I could process all 4 lines once I
>> found the 1st one. This is definitely *not* critical, what I have now
>> works AOK, I was/am just curious if it could be optimized a bit. TIA &
>> have a good one.
>
> Awk already handles multiple lines just fine, so you're looking for
> something else but don't know how to articulate it.
>
> Considering you're referring to 'pulling out lines', maybe you want to
> trap the output of smartctl into a variable, then just echo that to
> grep a bunch of times, before awk?
>
> ie;
>
> x=$(smartctl)
>
> echo "$x" | grep 'foo' | awk '{print $1}'
> echo "$x" | grep 'bar' | awk '{print $2}'
> echo "$x" | grep 'baz' | awk '{print $3}'
>
> ...etc?
>
> Although depending on what exactly you want to pull from the smartctl
> output, you can probably just do it all from awk in one incantation.
> Awk scripts can be fairly powerful.
I missed that 1st point somehow (relatively new to using awk :-/ ), so
that is indeed all I need to know how to do. Polytropon provided exactly
the guidance I need (I *think*) & I will try that out on the morrow.
Thanks & have a good one :-) ....
--
William A. Mahaffey III
----------------------------------------------------------------------
"The M1 Garand is without doubt the finest implement of war
ever devised by man."
-- Gen. George S. Patton Jr.
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