UNIX for Advanced & Expert Users

We have a log file which has 16 million row. We want to read all the lines appended from the last time we read using sed command

Code:

sed -n '<START_LINE>,<LAST_LINE>p' abc.csv

I can store this last line line so I can give replace that with START_LINE in my next read. The problem is wc -l which would give me the total lines in the file which I can store it as LAST_LINE takes time to read this ever growing huge file Is there a faster way to implement this?

sed -n '<startLine>,$p' myFile will read from startLine to the end of the file.

Don't use sed nor wc to read that huge file again and again. Why don't you keep last time's file size, and then skip that with dd? Have a look here. If your dd allows for iflag=skip_bytes, use this as it skips bytes but reads blocks.