I needed an overview of all zypper's commands and options, so i created this little script that prints all the help texts. It can be used to search for options through all commands, or to create a reference sheet for printing like this:
$ ./zypper-help-all | fold -s | a2ps -rjB --columns 3 -o file.ps
todo: fix some inconsistencies in option names (see this thread for discussion)
todo: wrap the help texts at 79th column, bug #423007 (no more need for 'fold -s' in the command above)
