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#1: Fw: redirect system command STDER

Posted on 2011-07-20 14:38:02 by Shlomi Fish

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Hi,

we keep receiving these messages when posting to beginners@perl.org. Can you
please unsubscribe lellis@claimspages.com from it?

Regards,

-- Shlomi Fish

--=20
------------------------------------------------------------ -----
Shlomi Fish http://www.shlomifish.org/
My Aphorisms - http://www.shlomifish.org/humour.html

Chuck Norris can make the statement â€=9CThis statement is false.â€=
=9D a true one.

Please reply to list if it's a mailing list post - http://shlom.in/reply .

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IDT) Date: Wed, 20 Jul 2011 12:42:45 +0300 From: Shlomi Fis=
h <shlomif@shlomifish.org> To: Jim Gibson <jimsgibson@gmail.=
com> Cc: <beginners@perl.org> Subject: Re: redirect system =
command STDER Message-ID: <20110720124245.0192b2a6@telaviv1.=
shlomifish.org> In-Reply-To: <CA4B5FB6.13520%JimSGibson@gmai=
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BD0:01CC4 6C1] Hi Jim, On Tue, 19 Jul 2011 16:22:14 -0=
700 Jim Gibson <jimsgibson@gmail.com> wrote: > On 7/19/11=
Tue Jul 19, 2011 12:14 PM, "Tessio Fechine" <oissetf@gmail=
..com> > scribbled: > > > Hello, > > I have a subroutine =
that uses useradd to create accounts > > > > -- > > @cmd =
=3D ('useradd', '-m', $account); > > my $result =3D system @cmd;=
> > -- > > > > but when useradd fails, I need to stop it=
from sending the error message to > > STDER. > > Is it po=
ssible with system? > > You can use a shell process to dis=
card STDERR messages (untested): > > my $cmd =3D "useradd -m=
$account 2> /dev/null"; > my $result =3D system($cmd); > =0D=
=0AThe problem with interpolating strings into shell commands l=
ike that is that someone may put malicious code in it: =09=
my $account =3D 'foo; rm -fr / '; so be careful - see: http:=
//shlomif-tech.livejournal.com/35301.html (Code/Markup Injec=
tion and Its Prevention ). Regards, =09Shlomi Fish > Y=
ou could do the same by writing a shell script to redirect ST=
DERR and call > that from your Perl program. > > You can=
also use the IPC::Open3 module to capture STDERR. See 'perld=
oc > IPC::Open3' for examples. > > > > -- -=
------------------------------------------------------------ -=
--- Shlomi Fish http://www.shlomifish.org/ Apple Inc.=
is Evil - http://www.shlomifish.org/open-source/anti/apple/=0D=
=0AAn apple a day keeps the doctor away. Two apples a day wi=
ll keep two doctors away. â€=94 one of Shlomi Fishâ€=99s re=
latives Please reply to list if it's a mailing list post -=
http://shlom.in/reply . -- To unsubscribe, e-mail: begi=
nners-unsubscribe@perl.org For additional commands, e-mail: =
beginners-help@perl.org http://learn.perl.org/ =0D =0A
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