Question

I have a log file with format

id operation

id success message

The second id is same as the first, but if only the the operation is successful. How can I get these two lines from the log to a new file?

Answer 1

it’s primative but you could do something like this quite easily:

cat file.log | cut -d " " -f1 | uniq -d > succesfulOperationIDs.dat

while read line
do
     grep ^$line file.log > successLog.log
done < succesfulOperationIDs.dat

rm -f succesfulOperationIDs.dat

This creates a list of id’s that appear more than once (assuming a space is the right delimeter) then puts all lines beginning with those id’s into a new file.