Date: Wed, 25 Apr 2007 12:00:42 -0700 From: Gary Kline <kline@tao.thought.org> To: Matthew Seaman <m.seaman@infracaninophile.co.uk> Cc: Gary Kline <kline@tao.thought.org>, FreeBSD Mailing List <freebsd-questions@freebsd.org> Subject: Re: first of misc questions.... Message-ID: <20070425190042.GA70940@thought.org> In-Reply-To: <462F0824.5000107@infracaninophile.co.uk> References: <20070425072914.GA65634@thought.org> <462F0824.5000107@infracaninophile.co.uk>
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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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--
Gary Kline kline@thought.org www.thought.org Public Service Unix
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