sample file (comma as field separators)
MessageFlow,1,BusIntBatchMgr,a
OOBEvent,1,BusIntBatchMgr,a
TaskEvents,1,,a
MTTrace,1,,a
MTWarning,,1,a
MessageFlow,1,Batch,a
OOBEvent,1,Batch,a
TaskEvents,1,,a
EAISAPIdocWizard,1,BusIntMgr,a
EAISAPBAPIWizard,1,BusIntMgr,a
EAISiebelWizard,1,BusIntMgr,a
In the above file, some lines have empty field3. The requirement is to fill the missing field3 with the previous field3 value.
i.e. In line 3,4&5, field3 should have the value BusIntBatchMgr. In line 8, field3 should have the value Batch.
Please let me know how to achieve this in PERL, SED or AWK (any combination). Please give me the code. Thanks in advance.