the arguments you are passing to the install command are not correct. you should use
"C:\Program Files\BMC BladeLogic\RSC\agentctl" -b exec C:\tmp\RSCD81-SP2-WIN32.exe -a -s -f1C:\tmp\81-SP2-WIN32.iss
note the -s inplace of the -r.
-r = silent record
-s = silent install
Thanks bill it is working, sometimes CTL-C CTL-V creates lot of problems