PERL Beginners - How to empty the buffer

Author

How to empty the buffer

Sreedhar Kalkunte-Venkatachala

2004-10-24, 8:55 am

Hi

I have written a program to add the strings. Now after every execution =
how to flush out the out. how
$i =3D 0;
while(<LOGFILE> )
{
$i++;
if ($i > 10)
{
last;
}
$var =3D $_;
$msg2=3D"$var\n";
}
print $msg2;

After this I want to empty the $msg2. How?

Regards
Sreedhar

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Bee

2004-10-24, 8:55 am

If you are using 'strict', you must applies '$msg2 = $var' as 'my $msg2 =
$var',
You are highly recomment to use strict, because you won't need to take care
of
this question at all, $msg2 will destroy after the sub/loop, the entire
scope ends
anyway.

For your question :

undef $msg2 ;
or
$msg2 = undef;

HTH,
Bee

----- Original Message -----
From: <Sreedhar.Kalkunte-Venkatachala@ubs.com>
To: <beginners@perl.org>
Sent: Sunday, October 24, 2004 6:36 PM
Subject: How to empty the buffer

Hi

I have written a program to add the strings. Now after every execution how
to flush out the out. how
$i = 0;
while(<LOGFILE> )
{
$i++;
if ($i > 10)
{
last;
}
$var = $_;
$msg2="$var\n";
}
print $msg2;

After this I want to empty the $msg2. How?

Regards
Sreedhar

Visit our website at http://www.ubs.com

This message contains confidential information and is intended only
for the individual named. If you are not the named addressee you
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Flemming Greve Skovengaard

2004-10-24, 8:55 am

Sreedhar.Kalkunte-Venkatachala@ubs.com wrote:
> Hi
>
> I have written a program to add the strings. Now after every execution how to flush out the out. how
> $i = 0;
> while(<LOGFILE> )
> {
> $i++;
> if ($i > 10)
> {
> last;
> }
> $var = $_;
> $msg2="$var\n";
> }
> print $msg2;
>
> After this I want to empty the $msg2. How?
>
> Regards
> Sreedhar

$msg2 = "";

--
Flemming Greve Skovengaard The prophecy of the holy Norns
a.k.a Greven, TuxPower A tale of death and doom
<dsl58893@vip.cybercity.dk> Odin saw the final sign
4112.38 BogoMIPS The end is coming soon

Sreedhar Kalkunte-Venkatachala

2004-10-24, 8:55 am

thanks. problem resolved

-----Original Message-----
From: Flemming Greve Skovengaard [mailto:dsl58893@vip.cybercity.dk]
Sent: 24 October 2004 12:13
To: beginners@perl.org
Cc: Kalkunte-Venkatachala, Sreedhar
Subject: Re: How to empty the buffer

Sreedhar.Kalkunte-Venkatachala@ubs.com wrote:
> Hi
>=20
> I have written a program to add the strings. Now after every execution =
how to flush out the out. how
> $i =3D 0;
> while(<LOGFILE> )
> {
> $i++;
> if ($i > 10)
> {
> last;
> }
> $var =3D $_;
> $msg2=3D"$var\n";
> }
> print $msg2;
>=20
> After this I want to empty the $msg2. How?
>=20
> Regards
> Sreedhar

$msg2 =3D "";

--=20
Flemming Greve Skovengaard The prophecy of the holy =
Norns
a.k.a Greven, TuxPower A tale of death and doom
<dsl58893@vip.cybercity.dk> Odin saw the final sign
4112.38 BogoMIPS The end is coming soon

Visit our website at http://www.ubs.com

This message contains confidential information and is intended only
for the individual named. If you are not the named addressee you
should not disseminate, distribute or copy this e-mail. Please
notify the sender immediately by e-mail if you have received this
e-mail by mistake and delete this e-mail from your system.

E-mail transmission cannot be guaranteed to be secure or error-free
as information could be intercepted, corrupted, lost, destroyed,
arrive late or incomplete, or contain viruses. The sender therefore
does not accept liability for any errors or omissions in the contents
of this message which arise as a result of e-mail transmission. If
verification is required please request a hard-copy version. This
message is provided for informational purposes and should not be
construed as a solicitation or offer to buy or sell any securities or
related financial instruments.

Charles K. Clarkson

2004-10-24, 3:55 pm

From: Sreedhar.Kalkunte-Venkatachala@ubs.com <> wrote:

: Hi
:
: I have written a program to add the strings. Now after every
: execution how to flush out the out. how
: $i = 0;
: while(<LOGFILE> )
: {
: $i++;
: if ($i > 10)
: {
: last;
: }
: $var = $_;
: $msg2="$var\n";
: }
: print $msg2;

You have coded an algorithm which prints the tenth line in
a file. The loop just discards the next 9 lines. Then you print
out the tenth line. Since you referred to a buffer, I doubt that
is what you were trying to accomplish.

# Discard next 9 lines
<LOGFILE> foreach 1 .. 9;

print scalar <LOGFILE>, "\n";

HTH,

Charles K. Clarkson
--
Mobile Homes Specialist
254 968-8328

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