Date: Wed, 3 Jan 2007 10:42:44 -0800 From: "Kurt Buff" <kurt.buff@gmail.com> To: "James Long" <list@museum.rain.com> Cc: freebsd-questions@freebsd.org Subject: Re: Batch file question - average size of file in directory Message-ID: <a9f4a3860701031042u45757b7ag897d55e1969f84b8@mail.gmail.com> In-Reply-To: <20070103035000.GA99263@ns.umpquanet.com> References: <20070102200721.31D1C16A517@hub.freebsd.org> <20070103035000.GA99263@ns.umpquanet.com>
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On 1/2/07, James Long <list@museum.rain.com> wrote:
<snip my problem description>
> Hi, Kurt.
>
> Can I make some assumptions that simplify things? No kinky filenames,
> just [a-zA-Z0-9.]. My approach specifically doesn't like colons or
> spaces, I bet. Also, you say gzipped, so I'm assuming it's ONLY gzip,
> no bzip2, etc.
Right, no other compression types - just .gz.
Here's a small snippet of the directory listing:
-rw-r----- 1 kurt kurt 108208 Dec 21 06:15 dummy-zKLQEWrDDOZh
-rw-r----- 1 kurt kurt 24989 Dec 28 17:29 dummy-zfzaEjlURTU1
-rw-r----- 1 kurt kurt 30596 Jan 2 19:37 stuff-0+-OvVrXcEoq.gz
-rw-r----- 1 kurt kurt 2055 Dec 22 20:25 stuff-0+19OXqwpEdH.gz
-rw-r----- 1 kurt kurt 13781 Dec 30 03:53 stuff-0+1bMFK2XvlQ.gz
-rw-r----- 1 kurt kurt 11485 Dec 20 04:40 stuff-0+5jriDIt0jc.gz
> Here's a first draft that might give you some ideas. It will output:
>
> foo.gz : 3456
> bar.gz : 1048576
> (etc.)
>
> find . -type f | while read fname; do
> file $fname | grep -q "compressed" && echo "$fname : $(zcat $fname | wc -c)"
> done
>
>
> If you really need a script that will do the math for you, then
> pip the output of this into bc:
>
> #!/bin/sh
>
> find . -type f | {
>
> n=0
> echo scale=2
> echo -n "("
> while read fname; do
> if file $fname | grep -q "compressed"
> then
> echo -n "$(zcat $fname | wc -c)+"
> n=$(($n+1))
> fi
> done
> echo "0) / $n"
>
> }
>
> That should give you the average decompressed size of the gzip'ped
> files in the current directory.
Hmmm....
That's the same basic approach that Giogos took, to uncompress the
file and count bytes with wc. I'm liking the 'zcat -l' contstruct, as
it looks more flexible, but then I have to parse the output, probably
with grep and cut.
Time to put on my thinking cap - I'll get back to the list on this.
Kurt
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