Date: Thu, 26 Apr 2007 03:15:16 -0700 From: Garrett Cooper <youshi10@u.washington.edu> Cc: FreeBSD Mailing List <freebsd-questions@freebsd.org> Subject: Re: first of misc questions.... Message-ID: <46307BB4.109@u.washington.edu> In-Reply-To: <20070425190042.GA70940@thought.org> References: <20070425072914.GA65634@thought.org> <462F0824.5000107@infracaninophile.co.uk> <20070425190042.GA70940@thought.org>
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Gary Kline wrote:
> On Wed, Apr 25, 2007 at 08:49:56AM +0100, Matthew Seaman wrote:
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>> Gary Kline wrote:
>>> Guys,
>>>
>>> This is an awk-type question. Hopefully a one-liner. If I
>>> need to use #!/usr/bin/awk and a BEGIN/END (or whatever it is),
>>> that's okay...
>>>
>>> I want to do an ls -l in a /home/kline/<directory> and find and
>>> edit files that are dated (let's say) Apr 19 or Mar 26. This
>>> works to print $9 the filenames.
>>>
>>> ls -l| awk '{if ($6 == "Apr" && $7 == 19 || $6 == "Mar" && $7
>>> == 26 ) print $9}'
>>>
>>> What's the final part to get awk to vi $9? Or another pipe and
>>> xargs and <what> "vi"? Nothing simple works, so thanks for any
>>> clues!
>>>
>> xargs(1) is your friend.
>>
>> Simply arrange for your awk script to print out the names of all the
>> files you have selected to edit, then pipe the result into xargs.
>> Like so:
>>
>> ls -l| awk '{if ($6 == "Apr" && $7 == 19 || $6 == "Mar" && $7 == 26 )
>> print $9}' | xargs vi
>
>
> Doing a pipe thru "xargs vi" is the first thing that
> failed--with:
>
> ex/vi: Vi's standard input and output must be a terminal
>
>
> whereas
>
> ls -l| awk '{if ($6 == "Apr" && $7 == 19 || $6 == "Mar" && $7
> == 26 ) print $9}'
>
>
> printed a slew of files to stdout.
>
>> This does assume that the file names you are using do not contain
>> spaces, quote marks, brackets or other characters of syntactical
>> significance to the shell. In that case you could use something like
>> this:
>>
>> find . -type f \( -mtime 6 -o -mtime 29 \) -print0 | xargs -0 vi
>
>
> No, no non-ASCII characters in the filenames. I'll try the -0
> and see if that gets rid of the "must be a terminal" blurb...
>
>
> ph 11:47 <tao> [5133] ls -l| awk '{if ($6 == "Apr" && $7 == 19 || $6 ==
> "Mar" && $7 == 26 ) print $9}' | xargs -0 vi
> ex/vi: Files with newlines in the name are unrecoverable
> ex/vi: Modifications not recoverable if the session fails
> ex/vi: Vi's standard input and output must be a terminal
>
>
> Ah, so vi sees "filename\n" ... perhaps. [?]
>
>
>
>
>> where find's '-print0' and the '-0' flag to xargs make the commands
>> produce and consume respectively a null separated list of filenames.
>>
>> Unfortunately with find(1) there doesn't seem to be a way of expressing
>> an absolute date / time -- all you can do is the time difference between
>> now and when you want (which defaults to 'number of days' but can be set
>> to use various other time units. I can think of a couple of ways of
>> calculating that, but personally I'd find it cleaner to just roll the
>> whole thing into a small perl script which identified the files in
>> question and forked off an instance of vi(1) to do the editing.
>>
>
>
> You're probably right about the script. There are at least
> dozens of files around ... they could be /bin/mv'd or cp'd to
> a tmp and then run thru vi. --Or??
>
> thanks much, Matthew. appreciate it,
>
> gary
>
>
>> Cheers,
>>
>> Matthew
>>
>> - --
>> Dr Matthew J Seaman MA, D.Phil. Flat 3
>> 7 Priory Courtyard
>> PGP: http://www.infracaninophile.co.uk/pgpkey Ramsgate
>> Kent, CT11 9PW, UK
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>
Or my favorite structure (bourne shell style)..
for i in `ls -l | awk '{if ($6 == "Apr" && $7 == 19 || $6 == "Mar" &&
$7 == 26 ) print $9}'`; do vi $i; done
Could you provide examples of what you are trying to edit though Gary?
Thanks,
-Garrett
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