[opensuse-factory] zypper -d switch, where to find?

Found the suggestion of using the -d switch in zypper dup a good idea. Tried to use it but the -d switch was not recognized. Looked through the help without spotting this switch. Could somebody help me out?. -- Linux User 183145 using KDE4 and LXDE on a Pentium IV , powered by openSUSE 20150630 (x86_64) Kernel: 4.0.5-3-desktop KDE Development Platform: 4.14.9 10:13am up 0:42, 2 users, load average: 0.10, 0.17, 0.36 -- To unsubscribe, e-mail: opensuse-factory+unsubscribe@opensuse.org To contact the owner, e-mail: opensuse-factory+owner@opensuse.org