can anyone please suggest how to do this? i believe perl or awk may
have easy solution.


what i am trying to achieve is to search for error code, if found then write Joining previous line and current line



here is input file layout

Record 1:xxxxxxxx
Error A:YYYYYYYY

Record 2:xxxxxxxx
Error A:YYYYYYYY

Record 3:xxxxxxxx
Error B:YYYYYYYY

Record 4:xxxxxxxx
Error A:YYYYYYYY

Record 5:xxxxxxxx
Error C:YYYYYYYY


=============================
desired output

Record 1:xxxxxxxx::Error A:YYYYYYYY
Record 2:xxxxxxxx::Error A:YYYYYYYY
Record 3:xxxxxxxx::Error B:YYYYYYYY
Record 4:xxxxxxxx::Error A:YYYYYYYY
Record 5:xxxxxxxx::Error C:YYYYYYYY

Thanks,

sdk,
try this:

awk '{if(substr($0,1,5)=="ERROR") print prev, $0;prev=$0}' my.file.txt

bye,
ducasio

Thanks ducasio,

was not aware that like next, there is prev also

Thanks for quick help.

prev is just a variable I declare and use. I could name it i as well and it would be writen like this:

awk '{if(substr($0,1,5)=="ERROR") print i, $0;i=$0}' my.file.txt

bye,
ducasio

Later I realized same.Thanks again for clarification.