[26807] in Perl-Users-Digest
Perl-Users Digest, Issue: 8850 Volume: 10
daemon@ATHENA.MIT.EDU (Perl-Users Digest)
Fri Jan 13 21:10:44 2006
Date: Fri, 13 Jan 2006 18:10:33 -0800 (PST)
From: Perl-Users Digest <Perl-Users-Request@ruby.OCE.ORST.EDU>
To: Perl-Users@ruby.OCE.ORST.EDU (Perl-Users Digest)
Perl-Users Digest Fri, 13 Jan 2006 Volume: 10 Number: 8850
Today's topics:
Posting Guidelines for comp.lang.perl.misc ($Revision: tadmc@augustmail.com
Re: ssh in system call (Gary E. Ansok)
Where to install stock of images for a script <.@.>
Re: Where to install stock of images for a script <matthew.garrish@sympatico.ca>
Re: Where to install stock of images for a script xhoster@gmail.com
Re: Where to install stock of images for a script <.@.>
Re: Where to install stock of images for a script <.@.>
Re: Where to install stock of images for a script <noreply@gunnar.cc>
Re: Where to install stock of images for a script <.@.>
Re: Where to install stock of images for a script <.@.>
Re: Where to install stock of images for a script <tadmc@augustmail.com>
Re: Where to install stock of images for a script <.@.>
while sleep 4; cat temperature <jidanni@jidanni.org>
Re: while sleep 4; cat temperature xhoster@gmail.com
Digest Administrivia (Last modified: 6 Apr 01) (Perl-Users-Digest Admin)
----------------------------------------------------------------------
Date: 13 Jan 2006 08:22:20 GMT
From: tadmc@augustmail.com
Subject: Posting Guidelines for comp.lang.perl.misc ($Revision: 1.5 $)
Message-Id: <43c7633a$0$1762$8b463f8a@news.nationwide.net>
Outline
Before posting to comp.lang.perl.misc
Must
- Check the Perl Frequently Asked Questions (FAQ)
- Check the other standard Perl docs (*.pod)
Really Really Should
- Lurk for a while before posting
- Search a Usenet archive
If You Like
- Check Other Resources
Posting to comp.lang.perl.misc
Is there a better place to ask your question?
- Question should be about Perl, not about the application area
How to participate (post) in the clpmisc community
- Carefully choose the contents of your Subject header
- Use an effective followup style
- Speak Perl rather than English, when possible
- Ask perl to help you
- Do not re-type Perl code
- Provide enough information
- Do not provide too much information
- Do not post binaries, HTML, or MIME
Social faux pas to avoid
- Asking a Frequently Asked Question
- Asking a question easily answered by a cursory doc search
- Asking for emailed answers
- Beware of saying "doesn't work"
- Sending a "stealth" Cc copy
Be extra cautious when you get upset
- Count to ten before composing a followup when you are upset
- Count to ten after composing and before posting when you are upset
-----------------------------------------------------------------
Posting Guidelines for comp.lang.perl.misc ($Revision: 1.5 $)
This newsgroup, commonly called clpmisc, is a technical newsgroup
intended to be used for discussion of Perl related issues (except job
postings), whether it be comments or questions.
As you would expect, clpmisc discussions are usually very technical in
nature and there are conventions for conduct in technical newsgroups
going somewhat beyond those in non-technical newsgroups.
The article at:
http://www.catb.org/~esr/faqs/smart-questions.html
describes how to get answers from technical people in general.
This article describes things that you should, and should not, do to
increase your chances of getting an answer to your Perl question. It is
available in POD, HTML and plain text formats at:
http://mail.augustmail.com/~tadmc/clpmisc.shtml
For more information about netiquette in general, see the "Netiquette
Guidelines" at:
http://andrew2.andrew.cmu.edu/rfc/rfc1855.html
A note to newsgroup "regulars":
Do not use these guidelines as a "license to flame" or other
meanness. It is possible that a poster is unaware of things
discussed here. Give them the benefit of the doubt, and just
help them learn how to post, rather than assume
A note about technical terms used here:
In this document, we use words like "must" and "should" as
they're used in technical conversation (such as you will
encounter in this newsgroup). When we say that you *must* do
something, we mean that if you don't do that something, then
it's unlikely that you will benefit much from this group.
We're not bossing you around; we're making the point without
lots of words.
Do *NOT* send email to the maintainer of these guidelines. It will be
discarded unread. The guidelines belong to the newsgroup so all
discussion should appear in the newsgroup. I am just the secretary that
writes down the consensus of the group.
Before posting to comp.lang.perl.misc
Must
This section describes things that you *must* do before posting to
clpmisc, in order to maximize your chances of getting meaningful replies
to your inquiry and to avoid getting flamed for being lazy and trying to
have others do your work.
The perl distribution includes documentation that is copied to your hard
drive when you install perl. Also installed is a program for looking
things up in that (and other) documentation named 'perldoc'.
You should either find out where the docs got installed on your system,
or use perldoc to find them for you. Type "perldoc perldoc" to learn how
to use perldoc itself. Type "perldoc perl" to start reading Perl's
standard documentation.
Check the Perl Frequently Asked Questions (FAQ)
Checking the FAQ before posting is required in Big 8 newsgroups in
general, there is nothing clpmisc-specific about this requirement.
You are expected to do this in nearly all newsgroups.
You can use the "-q" switch with perldoc to do a word search of the
questions in the Perl FAQs.
Check the other standard Perl docs (*.pod)
The perl distribution comes with much more documentation than is
available for most other newsgroups, so in clpmisc you should also
see if you can find an answer in the other (non-FAQ) standard docs
before posting.
It is *not* required, or even expected, that you actually *read* all of
Perl's standard docs, only that you spend a few minutes searching them
before posting.
Try doing a word-search in the standard docs for some words/phrases
taken from your problem statement or from your very carefully worded
"Subject:" header.
Really Really Should
This section describes things that you *really should* do before posting
to clpmisc.
Lurk for a while before posting
This is very important and expected in all newsgroups. Lurking means
to monitor a newsgroup for a period to become familiar with local
customs. Each newsgroup has specific customs and rituals. Knowing
these before you participate will help avoid embarrassing social
situations. Consider yourself to be a foreigner at first!
Search a Usenet archive
There are tens of thousands of Perl programmers. It is very likely
that your question has already been asked (and answered). See if you
can find where it has already been answered.
One such searchable archive is:
http://groups.google.com/advanced_group_search
If You Like
This section describes things that you *can* do before posting to
clpmisc.
Check Other Resources
You may want to check in books or on web sites to see if you can
find the answer to your question.
But you need to consider the source of such information: there are a
lot of very poor Perl books and web sites, and several good ones
too, of course.
Posting to comp.lang.perl.misc
There can be 200 messages in clpmisc in a single day. Nobody is going to
read every article. They must decide somehow which articles they are
going to read, and which they will skip.
Your post is in competition with 199 other posts. You need to "win"
before a person who can help you will even read your question.
These sections describe how you can help keep your article from being
one of the "skipped" ones.
Is there a better place to ask your question?
Question should be about Perl, not about the application area
It can be difficult to separate out where your problem really is,
but you should make a conscious effort to post to the most
applicable newsgroup. That is, after all, where you are the most
likely to find the people who know how to answer your question.
Being able to "partition" a problem is an essential skill for
effectively troubleshooting programming problems. If you don't get
that right, you end up looking for answers in the wrong places.
It should be understood that you may not know that the root of your
problem is not Perl-related (the two most frequent ones are CGI and
Operating System related), so off-topic postings will happen from
time to time. Be gracious when someone helps you find a better place
to ask your question by pointing you to a more applicable newsgroup.
How to participate (post) in the clpmisc community
Carefully choose the contents of your Subject header
You have 40 precious characters of Subject to win out and be one of
the posts that gets read. Don't waste them. Take care while
composing them, they are the key that opens the door to getting an
answer.
Spend them indicating what aspect of Perl others will find if they
should decide to read your article.
Do not spend them indicating "experience level" (guru, newbie...).
Do not spend them pleading (please read, urgent, help!...).
Do not spend them on non-Subjects (Perl question, one-word
Subject...)
For more information on choosing a Subject see "Choosing Good
Subject Lines":
http://www.cpan.org/authors/id/D/DM/DMR/subjects.post
Part of the beauty of newsgroup dynamics, is that you can contribute
to the community with your very first post! If your choice of
Subject leads a fellow Perler to find the thread you are starting,
then even asking a question helps us all.
Use an effective followup style
When composing a followup, quote only enough text to establish the
context for the comments that you will add. Always indicate who
wrote the quoted material. Never quote an entire article. Never
quote a .signature (unless that is what you are commenting on).
Intersperse your comments *following* each section of quoted text to
which they relate. Unappreciated followup styles are referred to as
"top-posting", "Jeopardy" (because the answer comes before the
question), or "TOFU" (Text Over, Fullquote Under).
Reversing the chronology of the dialog makes it much harder to
understand (some folks won't even read it if written in that style).
For more information on quoting style, see:
http://web.presby.edu/~nnqadmin/nnq/nquote.html
Speak Perl rather than English, when possible
Perl is much more precise than natural language. Saying it in Perl
instead will avoid misunderstanding your question or problem.
Do not say: I have variable with "foo\tbar" in it.
Instead say: I have $var = "foo\tbar", or I have $var = 'foo\tbar',
or I have $var = <DATA> (and show the data line).
Ask perl to help you
You can ask perl itself to help you find common programming mistakes
by doing two things: enable warnings (perldoc warnings) and enable
"strict"ures (perldoc strict).
You should not bother the hundreds/thousands of readers of the
newsgroup without first seeing if a machine can help you find your
problem. It is demeaning to be asked to do the work of a machine. It
will annoy the readers of your article.
You can look up any of the messages that perl might issue to find
out what the message means and how to resolve the potential mistake
(perldoc perldiag). If you would like perl to look them up for you,
you can put "use diagnostics;" near the top of your program.
Do not re-type Perl code
Use copy/paste or your editor's "import" function rather than
attempting to type in your code. If you make a typo you will get
followups about your typos instead of about the question you are
trying to get answered.
Provide enough information
If you do the things in this item, you will have an Extremely Good
chance of getting people to try and help you with your problem!
These features are a really big bonus toward your question winning
out over all of the other posts that you are competing with.
First make a short (less than 20-30 lines) and *complete* program
that illustrates the problem you are having. People should be able
to run your program by copy/pasting the code from your article. (You
will find that doing this step very often reveals your problem
directly. Leading to an answer much more quickly and reliably than
posting to Usenet.)
Describe *precisely* the input to your program. Also provide example
input data for your program. If you need to show file input, use the
__DATA__ token (perldata.pod) to provide the file contents inside of
your Perl program.
Show the output (including the verbatim text of any messages) of
your program.
Describe how you want the output to be different from what you are
getting.
If you have no idea at all of how to code up your situation, be sure
to at least describe the 2 things that you *do* know: input and
desired output.
Do not provide too much information
Do not just post your entire program for debugging. Most especially
do not post someone *else's* entire program.
Do not post binaries, HTML, or MIME
clpmisc is a text only newsgroup. If you have images or binaries
that explain your question, put them in a publically accessible
place (like a Web server) and provide a pointer to that location. If
you include code, cut and paste it directly in the message body.
Don't attach anything to the message. Don't post vcards or HTML.
Many people (and even some Usenet servers) will automatically filter
out such messages. Many people will not be able to easily read your
post. Plain text is something everyone can read.
Social faux pas to avoid
The first two below are symptoms of lots of FAQ asking here in clpmisc.
It happens so often that folks will assume that it is happening yet
again. If you have looked but not found, or found but didn't understand
the docs, say so in your article.
Asking a Frequently Asked Question
It should be understood that you may have missed the applicable FAQ
when you checked, which is not a big deal. But if the Frequently
Asked Question is worded similar to your question, folks will assume
that you did not look at all. Don't become indignant at pointers to
the FAQ, particularly if it solves your problem.
Asking a question easily answered by a cursory doc search
If folks think you have not even tried the obvious step of reading
the docs applicable to your problem, they are likely to become
annoyed.
If you are flamed for not checking when you *did* check, then just
shrug it off (and take the answer that you got).
Asking for emailed answers
Emailed answers benefit one person. Posted answers benefit the
entire community. If folks can take the time to answer your
question, then you can take the time to go get the answer in the
same place where you asked the question.
It is OK to ask for a *copy* of the answer to be emailed, but many
will ignore such requests anyway. If you munge your address, you
should never expect (or ask) to get email in response to a Usenet
post.
Ask the question here, get the answer here (maybe).
Beware of saying "doesn't work"
This is a "red flag" phrase. If you find yourself writing that,
pause and see if you can't describe what is not working without
saying "doesn't work". That is, describe how it is not what you
want.
Sending a "stealth" Cc copy
A "stealth Cc" is when you both email and post a reply without
indicating *in the body* that you are doing so.
Be extra cautious when you get upset
Count to ten before composing a followup when you are upset
This is recommended in all Usenet newsgroups. Here in clpmisc, most
flaming sub-threads are not about any feature of Perl at all! They
are most often for what was seen as a breach of netiquette. If you
have lurked for a bit, then you will know what is expected and won't
make such posts in the first place.
But if you get upset, wait a while before writing your followup. I
recommend waiting at least 30 minutes.
Count to ten after composing and before posting when you are upset
After you have written your followup, wait *another* 30 minutes
before committing yourself by posting it. You cannot take it back
once it has been said.
AUTHOR
Tad McClellan <tadmc@augustmail.com> and many others on the
comp.lang.perl.misc newsgroup.
------------------------------
Date: Wed, 11 Jan 2006 23:34:15 +0000 (UTC)
From: ansok@alumni.caltech.edu (Gary E. Ansok)
Subject: Re: ssh in system call
Message-Id: <dq44ln$ou1$1@naig.caltech.edu>
In article <dppovd$tpk$03$1@news.t-online.com>,
Klaus Boon <klausboon@web.de> wrote:
> >system("ssh $host tasks.sh &");
>
>and get problems. While running this line perl does
>start my tasks.sh but also does a real login on the
>specified $host's (what i dont want).
You don't show us how $host is set -- are you sure it contains
exactly what you think it does?
A line like print "Host = >>$host<<\n" can be helpful in
verifying this.
You may also want to check out the Perl function chomp()
(perldoc -f chomp).
Gary
--
Pay no attention to the reality behind the curtain.
------------------------------
Date: Wed, 11 Jan 2006 20:53:49 +0100
From: BlinKol <.@.>
Subject: Where to install stock of images for a script
Message-Id: <MPG.1e2f80b53ca9bf6998973b@news.tiscali.fr>
Considering a script that needs a fixed stock of images during its
process and knowing that this stock shouldn't be accessible out of the
script, where would you install these images ?
In my mind, the best would be to upload them in the same directory as
the Perl script himself, but it doesn't work : server-log says that the
image file is not exacutable and that it don't know how to handle it.
Here is a short test script to show what I want to say :
-- BEGIN OF /cgi-bin/test/test.pl SCRIPT --
#!c:/perl/bin/Perl.exe
print "Content-type: text/html\n\n";
print "<HTML><BODY>";
print "<img src='/cgi-bin/test/test.gif' border=0>";
print "</BODY></HTML>";
exit 0;
-- END OF SCRIPT --
The image doesn't appear in browser and server's error log says this :
-- FROM ERROR LOG --
[Wed Jan 11 20:40:17 2006] [error] [client 127.0.0.1]
C:/websites/vhosts/dev/cgi-bin/test/test.jpg is not executable; ensure
interpreted scripts have "#!" first line, referer: http://dev-desk/cgi-
bin/test/test.pl
[Wed Jan 11 20:40:17 2006] [error] [client 127.0.0.1] (9)Bad file
descriptor: don't know how to spawn child process:
C:/websites/vhosts/dev/cgi-bin/test/test.jpg, referer: http://dev-
desk/cgi-bin/test/test.pl
-- END OF ERROR --
Also, this test has been ran in Apache/ActivePerl under Windows, whitout
permission concern.
Do you have an idea about this error ? How would you do ?
------------------------------
Date: Wed, 11 Jan 2006 15:03:45 -0500
From: "Matt Garrish" <matthew.garrish@sympatico.ca>
Subject: Re: Where to install stock of images for a script
Message-Id: <wwdxf.18940$W03.510371@news20.bellglobal.com>
"BlinKol" <.@.> wrote in message
news:MPG.1e2f80b53ca9bf6998973b@news.tiscali.fr...
> Considering a script that needs a fixed stock of images during its
> process and knowing that this stock shouldn't be accessible out of the
> script, where would you install these images ?
>
Considering it's rude to post the same question again, I would suggest
stopping.
Matt
------------------------------
Date: 11 Jan 2006 20:19:05 GMT
From: xhoster@gmail.com
Subject: Re: Where to install stock of images for a script
Message-Id: <20060111151905.079$aU@newsreader.com>
BlinKol <.@.> wrote:
> Considering a script that needs a fixed stock of images during its
> process and knowing that this stock shouldn't be accessible out of the
> script, where would you install these images ?
I wouldn't install them at all. Since the script you show doesn't access
the images, and they shouldn't be accessible out of the script, then they
are never accessed and thus are not needed.
> In my mind, the best would be to upload them in the same directory as
> the Perl script himself, but it doesn't work : server-log says that the
> image file is not exacutable and that it don't know how to handle it.
Have the Perl script open the image, and send it out to the browser.
>
> Here is a short test script to show what I want to say :
>
> -- BEGIN OF /cgi-bin/test/test.pl SCRIPT --
> #!c:/perl/bin/Perl.exe
>
> print "Content-type: text/html\n\n";
> print "<HTML><BODY>";
> print "<img src='/cgi-bin/test/test.gif' border=0>";
> print "</BODY></HTML>";
> exit 0;
> -- END OF SCRIPT --
Here your Perl script is telling the user's browser to go get the image.
But you just said that only the Perl script (and hence not the user's
broswer) should be able to access the image. You can't have your cake
and eat it too.
Assuming you actually do want the images to be accessible to the user's
browser, then you need to move the images to a directory where your
web-server is willing to serve them from, or configure your web-server so
that it will serve images out of the cgi-bin directory rather than trying
to execute them as code (for example, by detecting the "jpg" ending),
neither of which have anything to do with Perl; or you need to make your
perl script serve up the images itself.
Xho
--
-------------------- http://NewsReader.Com/ --------------------
Usenet Newsgroup Service $9.95/Month 30GB
------------------------------
Date: Wed, 11 Jan 2006 21:54:32 +0100
From: BlinKol <.@.>
Subject: Re: Where to install stock of images for a script
Message-Id: <MPG.1e2f8ef42651be1e98973c@news.tiscali.fr>
In article <wwdxf.18940$W03.510371@news20.bellglobal.com>,
matthew.garrish@sympatico.ca says...
> Considering it's rude to post the same question again, I would suggest
> stopping.
>
> Matt
>
>
Sorry, but I did canceled the first one and reposted to correct an error
in my first message (about error).
------------------------------
Date: Wed, 11 Jan 2006 22:11:46 +0100
From: BlinKol <.@.>
Subject: Re: Where to install stock of images for a script
Message-Id: <MPG.1e2f9302384222a798973f@news.tiscali.fr>
In article <20060111151905.079$aU@newsreader.com>, xhoster@gmail.com
says...
> Here your Perl script is telling the user's browser to go get the image.
> But you just said that only the Perl script (and hence not the user's
> broswer) should be able to access the image. You can't have your cake
> and eat it too.
>
>
Thanks ! So obvious :-( So, how to manage the open to display the image
in an html page ? But, I've reposted the same question in
comp.infosystems.www.authoring.cgi since not perl specific.
------------------------------
Date: Thu, 12 Jan 2006 00:31:46 +0100
From: Gunnar Hjalmarsson <noreply@gunnar.cc>
Subject: Re: Where to install stock of images for a script
Message-Id: <42lir3F1jj35fU1@individual.net>
BlinKol wrote:
> xhoster@gmail.com wrote:
>>Here your Perl script is telling the user's browser to go get the image.
>>But you just said that only the Perl script (and hence not the user's
>>broswer) should be able to access the image. You can't have your cake
>>and eat it too.
>
> Thanks ! So obvious :-( So, how to manage the open to display the image
> in an html page ? But, I've reposted the same question in
> comp.infosystems.www.authoring.cgi since not perl specific.
Well, I for one find it hard to understand that how to do it in Perl
wouldn't be enough Perl related to show here... This is an example:
#!c:/perl/bin/Perl.exe -T
# test.pl
use strict;
use warnings;
my $imagedir = '/path/to/image/directory';
my $imagename = 'myimage.gif';
my $ctype = 'image/gif';
use CGI;
my $cgi = CGI->new;
if ( $cgi->param('img') ) {
imgprint("$imagedir/".$cgi->param('img'), $ctype);
} else {
htmlprint($imagename);
}
sub imgprint {
my ($path, $type) = @_;
print $cgi->header($type);
open my $f, $path or die "Couldn't open $path: $!";
binmode $f;
binmode STDOUT;
print while read $f, $_, 1024;
}
sub htmlprint {
my $imgname = shift;
print $cgi->header, <<HTML;
<html><body>
<img src="test.pl?img=$imgname" />
</body></html>
HTML
}
__END__
--
Gunnar Hjalmarsson
Email: http://www.gunnar.cc/cgi-bin/contact.pl
------------------------------
Date: Thu, 12 Jan 2006 11:15:03 +0100
From: BlinKol <.@.>
Subject: Re: Where to install stock of images for a script
Message-Id: <MPG.1e304a8f9ec94dfe989741@news.tiscali.fr>
In article <42lir3F1jj35fU1@individual.net>, noreply@gunnar.cc says...
> Well, I for one find it hard to understand that how to do it in Perl
> wouldn't be enough Perl related to show here... This is an example:
>
Tanks a lot Gunnar !
------------------------------
Date: Thu, 12 Jan 2006 11:43:59 +0100
From: BlinKol <.@.>
Subject: Re: Where to install stock of images for a script
Message-Id: <MPG.1e305158ebb6e08d989742@news.tiscali.fr>
In article <42lir3F1jj35fU1@individual.net>, noreply@gunnar.cc says...
> Well, I for one find it hard to understand that how to do it in Perl
> wouldn't be enough Perl related to show here... This is an example:
>
> #!c:/perl/bin/Perl.exe -T
> # test.pl
> use strict;
> use warnings;
>
> my $imagedir = '/path/to/image/directory';
> my $imagename = 'myimage.gif';
> my $ctype = 'image/gif';
>
> use CGI;
> my $cgi = CGI->new;
>
> ...
Well, here is the code without use of CGI package, in Perl :
#!c:/perl/bin/Perl.exe
use strict;
my $img = "test.jpg"; # same dir as current script
print "Content-Type: image/jpeg\n\n";
open FILE, $img or die "Couldn't open $img : $!";
binmode FILE;
binmode STDOUT;
print while read FILE, $_, 1024;
close FILE;
Maybe forgotten something around "Content-Length" (don't know), but,
apparently, it works fine.
Then, from this point I would like to be able to push test.jpg in the
framework of a generated html page. Something like this doesn't work :
#!c:/perl/bin/Perl.exe
use strict;
print "Content-type: text/html\n\n<HTML><BODY>";
print "<p>This is an image from cgi-bin space :</p><CENTER>";
my $img = "test.jpg"; # same dir as current script
print "Content-Type: image/jpeg\n\n";
open FILE, $img or die "Couldn't open $img : $!";
binmode FILE;
binmode STDOUT;
print while read FILE, $_, 1024;
close FILE;
print "</CENTER></BODY></HTML>";
exit 0;
How to do ?
------------------------------
Date: Thu, 12 Jan 2006 06:35:39 -0600
From: Tad McClellan <tadmc@augustmail.com>
Subject: Re: Where to install stock of images for a script
Message-Id: <slrndscj8r.o11.tadmc@magna.augustmail.com>
BlinKol <.@.> wrote:
> In article <42lir3F1jj35fU1@individual.net>, noreply@gunnar.cc says...
>> Well, I for one find it hard to understand that how to do it in Perl
>> wouldn't be enough Perl related to show here... This is an example:
[ snip ]
> Then, from this point I would like to be able to push test.jpg in the
Why would you like to do that?
If we know what your objection is, we might be able to come up
with a workaround for it...
> framework of a generated html page.
I don't know what a "framework of a generated html page" is.
> Something like this doesn't work :
>
> #!c:/perl/bin/Perl.exe
> use strict;
> print "Content-type: text/html\n\n<HTML><BODY>";
> print "<p>This is an image from cgi-bin space :</p><CENTER>";
>
> my $img = "test.jpg"; # same dir as current script
> print "Content-Type: image/jpeg\n\n";
> open FILE, $img or die "Couldn't open $img : $!";
> binmode FILE;
> binmode STDOUT;
> print while read FILE, $_, 1024;
> close FILE;
>
> print "</CENTER></BODY></HTML>";
> exit 0;
It doesn't work because that is not how HTTP and browsers work.
If you have a web page that includes 2 images, the browser will
make *three* HTTP requests, then stitch together the 3 results
for rendering.
> How to do ?
Output an <img> element whose src is a CGI program that returns
the correct response (an image in this case).
That is just what Gunnar's followup showed.
If you can describe what it is about Gunnar's approach that you
don't like, then maybe we can suggest an alternative.
--
Tad McClellan SGML consulting
tadmc@augustmail.com Perl programming
Fort Worth, Texas
------------------------------
Date: Thu, 12 Jan 2006 13:57:27 +0100
From: BlinKol <.@.>
Subject: Re: Where to install stock of images for a script
Message-Id: <MPG.1e3070a01abb97a8989747@news.tiscali.fr>
In article <slrndscj8r.o11.tadmc@magna.augustmail.com>,
tadmc@augustmail.com says...
> Output an <img> element whose src is a CGI program that returns
> the correct response (an image in this case).
>
> That is just what Gunnar's followup showed.
>
>
OK, it works now. In fact, I wanted to have entire code in the same
script. Then, I've included the Gunnar code (modified version without
use of CGI) in a sub, then call it through a self call with a parameter
in url like <http://dev-desk/cgi-bin/test/test.pl?load="test.jpg">.
Thanks to you and Gunnar :)
------------------------------
Date: Fri, 13 Jan 2006 21:13:26 +0000 (UTC)
From: Dan Jacobson <jidanni@jidanni.org>
Subject: while sleep 4; cat temperature
Message-Id: <87d5ivgbv7.fsf@jidanni.org>
How might I do this more efficiently?
while sleep 4; do perl -anwe 'print $F[1]." "' \
/proc/acpi/thermal_zone/THM0/temperature; done
First, no need for more than one process.
Second, must reopen the file each time.
Third, maybe there's a proc:: module that can help?
------------------------------
Date: 13 Jan 2006 21:42:34 GMT
From: xhoster@gmail.com
Subject: Re: while sleep 4; cat temperature
Message-Id: <20060113164234.210$N9@newsreader.com>
Dan Jacobson <jidanni@jidanni.org> wrote:
> How might I do this more efficiently?
> while sleep 4; do perl -anwe 'print $F[1]." "' \
> /proc/acpi/thermal_zone/THM0/temperature; done
> First, no need for more than one process.
OK. Then don't use more than one. Put the while inside the Perl, rather
than inside the bash.
> Second, must reopen the file each time.
OK, so do that. perldoc -f open.
> Third, maybe there's a proc:: module that can help?
Why would Proc module help if there is no need for more than one process?
If you demonstrated at least some attempt to do this in Perl before asking,
you might get better responses.
Xho
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