Dear Vpi,
I tried
pkg=pfring; rpm -qa | grep -q $pkg ; [ $? -eq 0 ] && echo $pkg is present
|| echo $pkg is not present . So this script I can just put pfring right ?
Ok first the rpm -qa | grep -q $pkg . What is [ $? -eq 0 ] doing ? What is
the difference with the next script? Thank you.
Regards,
Frwa.
On Tue, Aug 27, 2013 at 12:20 AM, [email protected] <[email protected]
> wrote:
> On 08/26/2013 06:06 PM, frwa onto wrote:
> > Dear Vpi,
> > I tried this pkg=pfring; rpm -qa | grep -q $pkg ; [ $? -eq
> 0 ] && echo ok, $pkg removed || echo $pkg
> > and gave me this pfring
>
> yes you;re right, since the pfring package is not installed anymore, the
> $? == 1 and then the if statement takes the || clausole
> so I believe the pfring is already uninstalled.
>
> for the record, if you want to check if a pkg is present (or not) use
> something like this:
>
> pkg=pkg_name; rpm -qa | grep -q $pkg ; [ $? -eq 0 ] && echo $pkg is
> present || echo $pkg is not present
>
> or even simpler
>
> pkg=pkg_name; rpm --quiet -q $pkg ; [ $? -eq 0 ] && echo $pkg is present
> || echo $pkg is not present
> (this will work but you have to use the exact name of the package, so I
> usually prefer the former)
>
> I know this is a lot convolute, but it could be used in a script ;)
>
> ciao
> -v
>
> >
> > Regards,
> > Frwa.
> >
> >
> > On Mon, Aug 26, 2013 at 11:59 PM, [email protected] <mailto:
> [email protected]> <[email protected] <mailto:[email protected]>>
> wrote:
> >
> > On 08/26/2013 05:45 PM, frwa onto wrote:
> > > Dear Vpi,
> > > This command is not showing anything rpm -ev $(rpm
> -qa | grep pfring) ?
> >
> > In case of success it wont produces any messages; if you want more
> verbosity use something like this:
> >
> > rpm -evH $(....
> >
> > -btw: you can test the bash exit status from the previous command,
> see [1]
> >
> > for example
> >
> > pkg=pfring; rpm -qa | grep -q $pkg ; [ $? -eq 0 ] && echo ok, $pkg
> removed || echo $pkg not found, perhaps already removed?
> >
> > ciao
> > vito
> >
> >
> > [1] http://tldp.org/LDP/abs/html/exit-status.html
> >
> > >
> > > Regards,
> > > Frwa.
> > >
> > >
> > > On Mon, Aug 26, 2013 at 11:41 PM, [email protected] <mailto:
> [email protected]> <mailto:[email protected] <mailto:
> [email protected]>> <[email protected] <mailto:[email protected]>
> <mailto:[email protected] <mailto:[email protected]>>> wrote:
> > >
> > > Dear frwa,
> > >
> > > I think you've installed the pf_ring rpm without using yum, so
> just type:
> > >
> > > rpm -ev $(rpm -qa | grep pfring)
> > >
> > > regards
> > > -v
> > >
> > > On 08/26/2013 05:32 PM, frwa onto wrote:
> > > > Dear All,
> > > > I have installed pf_ring using the yum method
> previously. Now I want to remove it so I ran and got this.
> > > >
> > > > yum remove pfring* -y
> > > > Loaded plugins: fastestmirror, security
> > > > Setting up Remove Process
> > > > No Match for argument: pfring-5.5.3-6016.x86_64.rpm
> > > > Loading mirror speeds from cached hostfile
> > > > * base: centos.mirror.iweb.ca <http://centos.mirror.iweb.ca>
> <http://centos.mirror.iweb.ca> <http://centos.mirror.iweb.ca>
> > > > * extras: centos.mirror.iweb.ca <
> http://centos.mirror.iweb.ca> <http://centos.mirror.iweb.ca> <
> http://centos.mirror.iweb.ca>
> > > > * updates: centos.mirror.iweb.ca <
> http://centos.mirror.iweb.ca> <http://centos.mirror.iweb.ca> <
> http://centos.mirror.iweb.ca>
> > > > No Packages marked for removal
> > > >
> > > > How to resolve this cause my pf_ring is still there? I want
> to install it from source now cause too many issue with the .rpm version.
> > > >
> > > >
> > > > _______________________________________________
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