Using Yum and Grep together

mjr4077au · 11-18-2009, 03:39 AM

Hello all,

N00bie question, but I was reading this guide for akmod that I cannot find again. In this guide, it explained a way of removing all NVIDIA packages using a combination of Yum and Grep to do it.

I have just upgraded from Fedora 11 to Fedora 12 and wanted to remove some orphaned Fedora 11 packages that didn't get erased. I thought this would be an easy way to do it.

If anyone can help, it'd be great

.

Cheers, Mitch.

knudfl · 11-18-2009, 05:32 AM

*

1) su

2) yum list installed | grep fc11

DaveQB · 11-18-2009, 06:35 AM

Code:

rpm -qa |grep fc11 > TEMP
while read pac ; do yum -y remove $pac ; done < TEMP
rm -f TEMP

Something like that should work.

To test it, just get it to print what it would do:

Code:

rpm -qa |grep fc11 > TEMP
while read pac ; do echo yum -y remove $pac ; done < TEMP
rm -f TEMP

mjr4077au · 11-18-2009, 03:02 PM

Hi Guys,

The "yum list installed | grep fc11" does work, just not 100% sure why I can't use it with the "erase" parameter.

I haven't tried that script, but it's certainly interesting. I'm going to try and learn more about bash scripting

.

Thanks for the quick responses, guys

.

Cheers, Mitch.

John VV · 11-18-2009, 04:31 PM

you could use "DaveQB" script BUT I WOULD NOT .

there is a -y tag in it

THAT IS VERY BAD

and something that WILL at some point kill a system from a simple typo .

from

Code:

yum list installed | grep fc11

that will give you a list .If it is long or you want a text copy you could do this
" yum list installed | grep fc11 > ~/f11.txt " and you will have a text file in your home folder

then

one at a time remove the fedora 11 rpm's
this is THE SAFEST WAY
"yum erase filename"

DaveQB · 11-18-2009, 06:26 PM

John VV is right in this situation.
The snippet I gave I have used to rip out 32bit packages on 100 or so machines, so it was scripted.

John VV · 11-19-2009, 12:24 AM

the main thing is with yum ( install or remove) the -y tag can be very dangerous .

i would not use it until you DO KNOW EXACTLY what you are doing
this is a example - DO NOT RUN THIS !!!!
"yum erase -y glibc "

the above will remove about 95% of the operating system

mjr4077au · 11-19-2009, 02:56 AM

Hi Guys,

I know the "-y" tag gives an automatic yes to everything. I have left the packages for now as I originally thought they were orphans from the upgrade, but they seem to be getting updated automatically from the Repos over time. I assume some apps just weren't packaged in time for F12 to release.

John VV is certainly right. By telling yum to erase all the fc11 packages left over wanted to remove over 200 packages, including "yum" and "rpm". That would have been disastrous for me!

Cheers, Mitch.