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
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