[31677] in Perl-Users-Digest
Perl-Users Digest, Issue: 2940 Volume: 11
daemon@ATHENA.MIT.EDU (Perl-Users Digest)
Tue May 11 06:09:25 2010
Date: Tue, 11 May 2010 03:09:06 -0700 (PDT)
From: Perl-Users Digest <Perl-Users-Request@ruby.OCE.ORST.EDU>
To: Perl-Users@ruby.OCE.ORST.EDU (Perl-Users Digest)
Perl-Users Digest Tue, 11 May 2010 Volume: 11 Number: 2940
Today's topics:
Re: can't read from STDIN after system call <ben@morrow.me.uk>
Re: can't read from STDIN after system call <rvtol+usenet@xs4all.nl>
Re: find/copy most recent version of file? (Seymour J.)
How can I use MAP to increment values in an array? <misterperl@gmail.com>
Re: How can I use MAP to increment values in an array? <misterperl@gmail.com>
Re: How can I use MAP to increment values in an array? <uri@StemSystems.com>
Re: How can I use MAP to increment values in an array? <rvtol+usenet@xs4all.nl>
Re: How can I use MAP to increment values in an array? <rvtol+usenet@xs4all.nl>
Re: how do i find the max value out of an array? <xhoster@gmail.com>
Re: how do i find the max value out of an array? <xhoster@gmail.com>
Posting Guidelines for comp.lang.perl.misc ($Revision: tadmc@seesig.invalid
Digest Administrivia (Last modified: 6 Apr 01) (Perl-Users-Digest Admin)
----------------------------------------------------------------------
Date: Mon, 10 May 2010 19:45:38 +0100
From: Ben Morrow <ben@morrow.me.uk>
Subject: Re: can't read from STDIN after system call
Message-Id: <ir0mb7-qb1.ln1@osiris.mauzo.dyndns.org>
Quoth David Resnick <lndresnick@gmail.com>:
> On May 10, 12:56 pm, Ben Morrow <b...@morrow.me.uk> wrote:
> > Quoth David Resnick <lndresn...@gmail.com>:
> >
> > > I've been poking at a script that loses the ability to ready from
> > > <STDIN> after doing a system() call.
> >
> > Please post your code, and also your OS and version of perl. Something
> > like
> >
> > perl -E'system "cat"; say scalar <STDIN>;'
> >
> > works just fine for me here. (The first ^D sends EOF to cat, and any
> > subsequent lines are happily read by perl.)
>
> As I mentioned in the follow up, closing stdin on the system command
> fixed it.
>
> It does not apply to any command, I discovered that early on. Once I
> saw that the "system" command is what seemed to mess up my STDIN, I
> tried the "date" run via system, didn't cause the issue.
>
> The relevant part of the code is here. Note sipp is an open source
> tool to handle SIP traffic. When run normally it does look for input
> in STDIN.
>
> getline("hit return when ready to execute test $testName\n");
>
> my $sippCommand = "$vobBase/thparty3/sipp/sipp -sf " .
> "$sippFile $remoteIpAddress -trace_msg -m 1 -l 1 -key
> testname $testName -key testdir $outputDirRoot/$testName" .
> " > /dev/null 2> /dev/null 0<&-";
It's generally safer to redirect stdin from /dev/null rather than
closing it. Closing it means the first file sipp opens will appear on
its fd 0, which may have unfortunate consequences.
> If I don't do the 0<&- in the system call, all future calls to <STDIN>
> return eof. But that seems to fix my problem, so I'm now merely just
> curious as to why this happens. I'm still mystified as to why, as I
> thought that system would create an independent process that couldn't
> alter its parents file descriptor state in any way.
It does create a separate process, but the two filehandles are still
somewhat connected. I can't see, off the top of my head, what sipp could
be doing to cause your STDIN to return EOF, but if you're interested you
could run the whole thing under strace to find out what it actually does
to fd 0.
Ben
------------------------------
Date: Mon, 10 May 2010 21:47:36 +0200
From: "Dr.Ruud" <rvtol+usenet@xs4all.nl>
Subject: Re: can't read from STDIN after system call
Message-Id: <4be862d8$0$22943$e4fe514c@news.xs4all.nl>
David Resnick wrote:
> I've been poking at a script that loses the ability to ready from
> <STDIN> after doing a system() call.
>
> I located this
> http://perldoc.perl.org/perlfaq8.html#Why-can%27t-my-script-read-from-STDIN-after-I-gave-it-EOF-%28^D-on-Unix,-^Z-on-MS-DOS%29?
> which seemed to be the obvious answer to my questions.
>
> But after doing this:
> STDIN->clearerr();
>
> or this:
>
> seek STDIN, 0, SEEK_SET
Here I decided that you need to read `perldoc -f open`.
Look for "perlipc".
--
Ruud
------------------------------
Date: Mon, 10 May 2010 05:32:44 -0400
From: Shmuel (Seymour J.) Metz <spamtrap@library.lspace.org.invalid>
Subject: Re: find/copy most recent version of file?
Message-Id: <4be7d2bc$7$fuzhry+tra$mr2ice@news.patriot.net>
In <87ocgoit2p.fsf@quad.sysarch.com>, on 05/09/2010
at 06:55 PM, "Uri Guttman" <uri@StemSystems.com> said:
>nope. not by a long shot. it doesn't say anything about paths
The term "folder" in the land of Mordor is equivalent to "directories"
in the land of *ix.
However, you are correct about not saying how to handle, e.g., empty
files.
--
Shmuel (Seymour J.) Metz, SysProg and JOAT <http://patriot.net/~shmuel>
Unsolicited bulk E-mail subject to legal action. I reserve the
right to publicly post or ridicule any abusive E-mail. Reply to
domain Patriot dot net user shmuel+news to contact me. Do not
reply to spamtrap@library.lspace.org
------------------------------
Date: Mon, 10 May 2010 12:44:24 -0700 (PDT)
From: Mr P <misterperl@gmail.com>
Subject: How can I use MAP to increment values in an array?
Message-Id: <d30e4da9-c9ba-4752-966f-047c84770fe5@r11g2000yqa.googlegroups.com>
I have an array in which I want to add a counter - for example, change
CAT to CAT #:
...so
CAT
DOG
CAT
MOUSE
EEL
CAT
becomes
CAT 1
DOG
CAT 2
MOUSE
EEL
CAT 3
Obviously I can write a little loop like
my $c = 0;
for ( @a )
{
next unless /^CAT/;
$c++; # wow that's weird
$_ .= " $c";
}
But what I'd prefer is something like
my $c = 1;
map s/^(CAT)/$1 $c++/e, @a;
I read and read on this, and I also tried:
map s/^(CAT)/$1 $c++/e, @a;
since it appeared that within the RHS of the s///, a single + was an
increment operator.
Am I in the ballpark here guys? Everything I've tried results in
interpreter errors.
Thanks,
MP
------------------------------
Date: Mon, 10 May 2010 12:45:31 -0700 (PDT)
From: Mr P <misterperl@gmail.com>
Subject: Re: How can I use MAP to increment values in an array?
Message-Id: <0da47cd9-c8a9-48b9-a9c7-d8e9b301b345@e2g2000yqn.googlegroups.com>
On May 10, 3:44=A0pm, Mr P <misterp...@gmail.com> wrote:
> I have an array in which I want to add a counter - for example, change
> CAT to CAT #:
>
> ...so
> CAT
> DOG
> CAT
> MOUSE
> EEL
> CAT
>
> becomes
> CAT 1
> DOG
> CAT 2
> MOUSE
> EEL
> CAT 3
>
> Obviously I can write a little loop like
>
> my $c =3D 0;
> for ( @a )
> {
> =A0 next unless /^CAT/;
> =A0 $c++; # wow that's weird
> =A0 $_ .=3D " $c";
> =A0}
>
> But what I'd prefer is something like
>
> =A0 my $c =3D 1;
> =A0 map s/^(CAT)/$1 $c++/e, @a;
>
> I read and read on this, and I also tried:
> =A0 map s/^(CAT)/$1 $c++/e, @a;
>
> since it appeared that within the RHS of the s///, a single + was an
> increment operator.
>
> Am I in the ballpark here guys? Everything I've tried results in
> interpreter errors.
>
> Thanks,
> MP
oops I mean I ALSO TRIED s/^(CAT)/$1 $c+/e, @a; # single +
------------------------------
Date: Mon, 10 May 2010 15:53:52 -0400
From: "Uri Guttman" <uri@StemSystems.com>
Subject: Re: How can I use MAP to increment values in an array?
Message-Id: <878w7r7ctr.fsf@quad.sysarch.com>
>>>>> "P" == P <misterperl@gmail.com> writes:
P> my $c = 0;
P> for ( @a )
P> {
P> next unless /^CAT/;
P> $c++; # wow that's weird
wierd in what way?
P> $_ .= " $c";
P> }
P> But what I'd prefer is something like
P> my $c = 1;
P> map s/^(CAT)/$1 $c++/e, @a;
that won't work. the replacement is an expression with /e. you are
thinking it is a string AND an expression. so make an expression
(multiple statements are allowed) with the last one being the
replacement value. something like this: (untested)
s/^(CAT)/$c++ ; "$1 $c:/e foreach @a;
and don't use map without returning a list. foreach modifier is better
for that.
P> I read and read on this, and I also tried:
P> map s/^(CAT)/$1 $c++/e, @a;
P> since it appeared that within the RHS of the s///, a single + was an
P> increment operator.
huh??
P> Am I in the ballpark here guys? Everything I've tried results in
P> interpreter errors.
well, everything you tried is a syntax error. as i said, the code in the
replacement part must be a valid expression under /e.
this by itself is not valid perl:
$1 $c++
uri
--
Uri Guttman ------ uri@stemsystems.com -------- http://www.sysarch.com --
----- Perl Code Review , Architecture, Development, Training, Support ------
--------- Gourmet Hot Cocoa Mix ---- http://bestfriendscocoa.com ---------
------------------------------
Date: Mon, 10 May 2010 22:00:24 +0200
From: "Dr.Ruud" <rvtol+usenet@xs4all.nl>
Subject: Re: How can I use MAP to increment values in an array?
Message-Id: <4be865d9$0$22920$e4fe514c@news.xs4all.nl>
Mr P wrote:
> I have an array in which I want to add a counter - for example, change
> CAT to CAT #:
>
> ....so
> CAT
> DOG
> CAT
> MOUSE
> EEL
> CAT
>
> becomes
> CAT 1
> DOG
> CAT 2
> MOUSE
> EEL
> CAT 3
perl -MData::Dumper -wle'
my (@r, %c);
push @r, [$_, ++$c{$_}]
for qw/ CAT DOG CAT MOUSE EEL CAT /;
print Dumper(\@r);
'
--
Ruud
------------------------------
Date: Mon, 10 May 2010 22:11:26 +0200
From: "Dr.Ruud" <rvtol+usenet@xs4all.nl>
Subject: Re: How can I use MAP to increment values in an array?
Message-Id: <4be8686e$0$22917$e4fe514c@news.xs4all.nl>
Dr.Ruud wrote:
> Mr P wrote:
>> I have an array in which I want to add a counter - for example, change
>> CAT to CAT #:
>>
>> ....so
>> CAT
>> DOG
>> CAT
>> MOUSE
>> EEL
>> CAT
>>
>> becomes
>> CAT 1
>> DOG
>> CAT 2
>> MOUSE
>> EEL
>> CAT 3
>
> perl -MData::Dumper -wle'
> my (@r, %c);
> push @r, [$_, ++$c{$_}]
> for qw/ CAT DOG CAT MOUSE EEL CAT /;
> print Dumper(\@r);
> '
And use %c to decide whether you want to print the "1".
perl -MData::Dumper -wle'
my (@r, %c, $k);
push @r, [$_, ++$c{$_}] for qw/ CAT DOG CAT MOUSE EEL CAT /;
print $k=$_->[0], $c{$k}>1 ? " $_->[1]" : "" for @r;
'
CAT 1
DOG
CAT 2
MOUSE
EEL
CAT 3
--
Ruud
------------------------------
Date: Sun, 09 May 2010 10:15:02 -0700
From: Xho Jingleheimerschmidt <xhoster@gmail.com>
Subject: Re: how do i find the max value out of an array?
Message-Id: <4be8adb4$0$23511$ed362ca5@nr5-q3a.newsreader.com>
John Bokma wrote:
> Xho Jingleheimerschmidt <xhoster@gmail.com> writes:
>
>> Jürgen Exner wrote:
>>> "sopan.shewale@gmail.com" <sopan.shewale@gmail.com> wrote:
>>>> Once you have array, how about?
>>>> my $max = (sort { $b <=> $a } @array)[0];
>>> If you insist on being inefficient,
>> We are discussing Perl, aren't we?
>
> Yup, and my experience is that good Perl runs fast enough.
Well, that really depends on fast enough for what. On occasion I've had
to rewrite certain parts in C to get the required speed, but that is
rare. And more to my point, my experience is that using sort is also
fast enough, at least in the context where Perl itself is fast enough.
I now use List::Util::max or min, but for stylistic reasons, not
efficiency reasons.
> I suspect
> Python to be a bit slower, but note that that's just a suspicion. On top
> of that I don't care.
Right.
Xho
------------------------------
Date: Sun, 09 May 2010 10:23:41 -0700
From: Xho Jingleheimerschmidt <xhoster@gmail.com>
Subject: Re: how do i find the max value out of an array?
Message-Id: <4be8adbe$0$23510$ed362ca5@nr5-q3a.newsreader.com>
Jürgen Exner wrote:
> Xho Jingleheimerschmidt <xhoster@gmail.com> wrote:
>> Jürgen Exner wrote:
>>> "sopan.shewale@gmail.com" <sopan.shewale@gmail.com> wrote:
>>>> Once you have array, how about?
>>>> my $max = (sort { $b <=> $a } @array)[0];
>>> If you insist on being inefficient,
>> We are discussing Perl, aren't we?
>
> Well, yeah, so? Are you implying that people should use inefficent
> algorithms when programming in Perl?
Depends on in what domain it is inefficient.
> Of course the cost for designing, writing, and maintaining the code is
> an important factor, too, and it often justifies the use of a less
> efficient algorithm.
Right, especially the difference in efficiency is factor of lnN, rather
than N or some higher order.
> However in this case where there are trivial, short and well-known
> algorithms for computing the largest element there is really no excuse
> for using a poor algorithm(*).
There is no such thing as a trivial algorithm. I've seen people screw
up even this one, no matter how short and well-known it may be.
Xho
------------------------------
Date: Tue, 11 May 2010 02:15:04 -0500
From: tadmc@seesig.invalid
Subject: Posting Guidelines for comp.lang.perl.misc ($Revision: 1.9 $)
Message-Id: <UsWdnUdJR5llnnTWnZ2dnUVZ_tWdnZ2d@giganews.com>
Outline
Before posting to comp.lang.perl.misc
Must
- Check the Perl Frequently Asked Questions (FAQ)
- Check the other standard Perl docs (*.pod)
Really Really Should
- Lurk for a while before posting
- Search a Usenet archive
If You Like
- Check Other Resources
Posting to comp.lang.perl.misc
Is there a better place to ask your question?
- Question should be about Perl, not about the application area
How to participate (post) in the clpmisc community
- Carefully choose the contents of your Subject header
- Use an effective followup style
- Speak Perl rather than English, when possible
- Ask perl to help you
- Do not re-type Perl code
- Provide enough information
- Do not provide too much information
- Do not post binaries, HTML, or MIME
Social faux pas to avoid
- Asking a Frequently Asked Question
- Asking a question easily answered by a cursory doc search
- Asking for emailed answers
- Beware of saying "doesn't work"
- Sending a "stealth" Cc copy
Be extra cautious when you get upset
- Count to ten before composing a followup when you are upset
- Count to ten after composing and before posting when you are upset
-----------------------------------------------------------------
Posting Guidelines for comp.lang.perl.misc ($Revision: 1.9 $)
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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 and many others on the comp.lang.perl.misc newsgroup.
--
Tad McClellan
email: perl -le "print scalar reverse qq/moc.liamg\100cm.j.dat/"
The above message is a Usenet post.
I don't recall having given anyone permission to use it on a Web site.
------------------------------
Date: 6 Apr 2001 21:33:47 GMT (Last modified)
From: Perl-Users-Request@ruby.oce.orst.edu (Perl-Users-Digest Admin)
Subject: Digest Administrivia (Last modified: 6 Apr 01)
Message-Id: <null>
Administrivia:
To submit articles to comp.lang.perl.announce, send your article to
clpa@perl.com.
Back issues are available via anonymous ftp from
ftp://cil-www.oce.orst.edu/pub/perl/old-digests.
#For other requests pertaining to the digest, send mail to
#perl-users-request@ruby.oce.orst.edu. Do not waste your time or mine
#sending perl questions to the -request address, I don't have time to
#answer them even if I did know the answer.
------------------------------
End of Perl-Users Digest V11 Issue 2940
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