[ale] zypper vs yast2 vs rpm installs on SLES/Open Suse

[Narahari 'n' Savitha]

Friends:

What is the difference between

zypper

yast2

yast

rpm

based installs ?

When to use what and what are pure command line options ?

For example if Firewall had to allow certain services I could not do it in
one line.  I had to navigate menus to do it.

Also comparing to Ubuntu, there are the regular repos and the ppa's.  Isnt
there a similar concept in SLES / Open SUSE ?

Can we mix and match repos between SLES and OpenSuse ? and what about
between minor version say between 11.1 and 11.4 ?

-Narahari
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