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From: Murray R. Van Luyn. on 31 Dec 2009 06:10
Hi,

I want to set the file modification times of files stored in a zip file.

I think I could work out how to unzip the files to a temporary location, hit
them with touch to modify their timestamps, and then store them back in a
new zip file that overwrites the original. I then have to clean-up the
temporary files. Obviously my method would involve a series of commands.

Okay, can any sneaky shell gurus think of a single command line that unzips
the files, pipes them through touch, and then pipes the results to zip to
replace the original archive?

Muz.


From: Sidney Lambe on 31 Dec 2009 07:19
On comp.unix.shell, houghi <houghi(a)houghi.org.invalid> wrote:

> Murray R. Van Luyn. wrote:
>
>> Okay, can any sneaky shell gurus think of a single command
>> line that unzips the files, pipes them through touch, and then
>> pipes the results to zip to replace the original archive?
>
> What is the reason it must be a oneliner? Just curious.

Good question. If, for some weird reason, there can't be
any newlines within the script, he can use semi-colons instead.

line 1 ; line 2 ; line 3 ...

Sid


From: Murray R. Van Luyn. on 31 Dec 2009 07:21
"houghi" <houghi(a)houghi.org.invalid> wrote in message
news:slrnhjp2n1.u03.houghi(a)penne.houghi...
> Murray R. Van Luyn. wrote:
>> Okay, can any sneaky shell gurus think of a single command line that
>> unzips
>> the files, pipes them through touch, and then pipes the results to zip to
>> replace the original archive?
>
> What is the reason it must be a oneliner? Just curious.
>
> houghi
> --
> If you owe the bank $100 that's your problem.
> If you owe the bank $100 million, that's the bank's problem.
> If you owe the bank $700 billion, it becomes your problem again.

Hi houghi,

That I wish to perform the task as a 'one liner' is purely of academic
interest. I'm just curious about how the piping mechanism works, and whether
it can be used to pass whole files between programs.

Muz.


From: Murray R. Van Luyn. on 31 Dec 2009 07:29
"Sidney Lambe" <sidneylambe(a)nospam.invalid> wrote in message
news:slrnhjp5lc.pga.sidneylambe(a)evergreen.net...
> On comp.unix.shell, houghi <houghi(a)houghi.org.invalid> wrote:
>
>> Murray R. Van Luyn. wrote:
>>
>>> Okay, can any sneaky shell gurus think of a single command
>>> line that unzips the files, pipes them through touch, and then
>>> pipes the results to zip to replace the original archive?
>>
>> What is the reason it must be a oneliner? Just curious.
>
> Good question. If, for some weird reason, there can't be
> any newlines within the script, he can use semi-colons instead.
>
> line 1 ; line 2 ; line 3 ...
>
> Sid
>
>

Hi Sidney,

Ah, that's one solution I hadn't thought of, but is interesting to note.
Thanks for that useful tip.

Yeah, it's really the elegance of piping whole files that I'm most curious
about.

Muz.


From: Sidney Lambe on 31 Dec 2009 08:09
On comp.unix.shell, Murray R. Van Luyn. <valid(a)email.address>
wrote:

> "Sidney Lambe" <sidneylambe(a)nospam.invalid> wrote in message
> news:slrnhjp5lc.pga.sidneylambe(a)evergreen.net...
>
>> On comp.unix.shell, houghi <houghi(a)houghi.org.invalid> wrote:
>>
>>> Murray R. Van Luyn. wrote:
>>>
>>>> Okay, can any sneaky shell gurus think of a single command
>>>> line that unzips the files, pipes them through touch, and
>>>> then pipes the results to zip to replace the original
>>>> archive?
>>>
>>> What is the reason it must be a oneliner? Just curious.
>>
>> Good question. If, for some weird reason, there can't be any
>> newlines within the script, he can use semi-colons instead.
>>
>> line 1 ; line 2 ; line 3 ...
>>
>> Sid
>>
>
>
> Hi Sidney,
>
> Ah, that's one solution I hadn't thought of, but is interesting
> to note. Thanks for that useful tip.
>
> Yeah, it's really the elegance of piping whole files that I'm
> most curious about.
>
> Muz.
>
>

I can relate to that, Murray, but I think you better choose
something other than touch for your experiments, because
I don't think it takes piped input.

Here's a couple of relevant scripts you might find enlightening.
They are used to send a bunch of files to a remoted machine
using netcat (nc). "1234" is the port number:

Send tar cfp - /some/dir | compress -c | nc -w 3 othermachine 1234


Receive nc -l -p 1234 | uncompress -c | tar xvfp -


Sid


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