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Hi,
we keep receiving these messages when posting to beginners [at] perl.org. Can you
please unsubscribe lellis [at] claimspages.com from it?
Regards,
-- Shlomi Fish
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Shlomi Fish http://www.shlomifish.org/
My Aphorisms - http://www.shlomifish.org/humour.html
Chuck Norris can make the statement =E2=80=9CThis statement is false.=E2=80=
=9D a true one.
Please reply to list if it's a mailing list post - http://shlom.in/reply .
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Subject: Re: Re: redirect system command STDER
To: shlomif [at] shlomifish.org
Date: Wed, 20 Jul 2011 05:43:51 -0400
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IDT)=0D=0ADate: Wed, 20 Jul 2011 12:42:45 +0300=0D=0AFrom: Shlomi Fis=
h <shlomif [at] shlomifish.org>=0D=0ATo: Jim Gibson <jimsgibson [at] gmail.=
com>=0D=0ACc: <beginners [at] perl.org>=0D=0ASubject: Re: redirect system =
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BD0:01CC4=0D=0A6C1]=0D=0A=0D=0AHi Jim,=0D=0A=0D=0AOn Tue, 19 Jul 2011 16:22:14 -0=
700=0D=0AJim Gibson <jimsgibson [at] gmail.com> wrote:=0D=0A=0D=0A> On 7/19/11=
Tue Jul 19, 2011 12:14 PM, "Tessio Fechine" <oissetf [at] gmail=
..com>=0D=0A> scribbled:=0D=0A> =0D=0A> > Hello,=0D=0A> > I have a subroutine =
that uses useradd to create accounts=0D=0A> > =0D=0A> > --=0D=0A> > [at] cmd =
=3D ('useradd', '-m', $account);=0D=0A> > my $result =3D system [at] cmd;=
=0D=0A> > --=0D=0A> > =0D=0A> > but when useradd fails, I need to stop it=
from sending the error message=0D=0Ato=0D=0A> > STDER.=0D=0A> > Is it po=
ssible with system?=0D=0A> =0D=0A> You can use a shell process to dis=
card STDERR messages (untested):=0D=0A> =0D=0A> my $cmd =3D "useradd -m=
$account 2> /dev/null";=0D=0A> my $result =3D system($cmd);=0D=0A> =0D=0A=0D=
=0AThe problem with interpolating strings into shell commands l=
ike that is=0D=0Athat=0D=0Asomeone may put malicious code in it:=0D=0A=0D=0A=09=
my $account =3D 'foo; rm -fr / ';=0D=0A=0D=0Aso be careful - see: http:=
//shlomif-tech.livejournal.com/35301.html=0D=0A(Code/Markup Injec=
tion and Its Prevention ).=0D=0A=0D=0ARegards,=0D=0A=0D=0A=09Shlomi Fish=0D=0A=0D=0A> Y=
ou could do the same by writing a shell script to redirect ST=
DERR and=0D=0Acall=0D=0A> that from your Perl program.=0D=0A> =0D=0A> You can=
also use the IPC::Open3 module to capture STDERR. See 'perld=
oc=0D=0A> IPC::Open3' for examples.=0D=0A> =0D=0A> =0D=0A> =0D=0A> =0D=0A=0D=0A=0D=0A=0D=0A-- =0D=0A-=
------------------------------------------------------------ -=
---=0D=0AShlomi Fish http://www.shlomifish.org/=0D=0AApple Inc.=
is Evil - http://www.shlomifish.org/open-source/anti/apple/=0D=
=0A=0D=0AAn apple a day keeps the doctor away.=0D=0ATwo apples a day wi=
ll keep two doctors away. =0D=0A =E2=80=94 one of Shlomi Fish=E2=80=99s re=
latives=0D=0A=0D=0APlease reply to list if it's a mailing list post -=
http://shlom.in/reply=0D=0A.=0D=0A=0D=0A--=0D=0ATo unsubscribe, e-mail: begi=
nners-unsubscribe [at] perl.org=0D=0AFor additional commands, e-mail: =
beginners-help [at] perl.org=0D=0Ahttp://learn.perl.org/=0D=0A=0D =0A=0D=0A
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