CentOS 5.3

[Charles Jones]

Alex Dean wrote:
>
> On Apr 1, 2009, at 1:40 PM, Eric Shubert wrote:
>
>>
>> yum list | grep openmpi     # (checking to see if it is installed)
>> yum list | grep lam         # (checking to see if it is installed)
>
> I think this will only find packages which were installed by yum.
>
> If you download an RPM to a machine (wget, scp, etc) and install it 
> using the 'rpm' command, it will not be found by 'yum list'.  Seems 
> like a big oversight, but that was my experience on some RHEL5 
> machines I was an admin for.  (I used RHEL4 more, and it still used 
> up2date.  yum is much superior but I didn't have as much experience 
> with it.)
To see if something is installed its best to do "rpm -qa |grep packagename"
If you want to see if there is an upgrade for a package, you would do 
"yum check-update" and optionally pipe that to grep for a packagename