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thanx.....

---------- Post updated at 06:31 PM ---------- Previous update was at 01:41 PM ----------

hi itkamaraj...i am new to unix, can you plz explain both the code......

thanx itkamaraj......that was very helpful...
but if there are multiple records like..
i/p
field1
field2
field3 field4
<blank row>
field1
field2
field3 field4
<blank row>

o/p...

input:

field1
field2
field3 field4

output:

"field1";"field2";"field3";"field4"

My input file is shown above and I want output as shown using awk. the length of field3 is fixed so, the...

input:

field1
field2
field3 field4

output:

"field1";"field2";"field3";"field4"

My input file is shown above and I want output as shown using awk. the length of field3 is fixed so,...

thanx neutronscott.....but if we are equating '!a[$1]++-==0' , its only printing the duplicate value and if we are doing '!a[$1]++==1' it is printing the first occurrence. how is that happening???

cat filename|nawk ' { FS="="; if (!a[$1]++ == 0) print $0 } '

can anyone plz explain how does array inexing works,how it is evaluating if (!a[$1]++ == 0)??