RPM

List all installed packages:
```
1$ rpm -qa
```
Get the list of all installed packages and their architecture:
```
1$ rpm -qa --queryformat "%-40{NAME} %-8{ARCH}\n"
```

Same as above, but show i586 packages only:

$ rpm -qa --queryformat "%-40{NAME} %-8{ARCH}\n" | grep i586

Downgrade a package to an old version:

$ wget ftp://ftp.repository.org/mandrakelinux/official/10.0/package-1.0-1mdk.i586.rpm
$ rpm -Uvh --oldpackage package-1.0-1mdk.i586.rpm

Unpack/Deflate/Extract a RPM without installing it:
```
1$ rpm2cpio dummy.src.rpm | cpio -id
```
Evaluate %mkrel 3 rpm macro:
```
1$ rpm --eval '%mkrel 3'
```
Force removal of a package that has problems with embedded “pre-” and/or “post-” scripts:
```
1$ rpm -e --noscripts packagename
```

Urpmi

List all available packages with name containing python :
```
1$ urpmq --fuzzy python
```
Find which RPM contain the file named dummy :
```
1$ urpmf dummy
```
Get information about the dummy RPM:
```
1$ urpmq -i dummy
```
Get the list of all RPMs that require python-psyco package:
```
1$ urpmf --requires python-psyco
```
Get the list of all RPMs that provide python-psyco package:
```
1$ urpmf --provides python-psyco
```

I use this command in a cron entry to update automatically and regularly my Mandriva:

$ /usr/sbin/urpmi.update -a && /usr/sbin/urpmi --update --auto --auto-select

Generate urpmi repository index and metadata of the current folder:
```
1$ genhdlist ./
```
APT/URPMI commands list

Install a new package:
```
1$ yum install subversion
```
Search for packages containing the x11 string:
```
1$ yum search x11
```
Get the list of packages that provide Python’s Subversion bindings:
```
1$ yum provides "*/svn/__init__.py"
```
Update repository index:
```
1$ yum update
```
Clear all caches (sometimes required to force a repository index update):
```
1$ yum clean all
```
Generate Yum repository index and metadata of the current folder:
```
1$ createrepo -v ./
```