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I have a process which is dumping data to a file. It is a list of transactions and typically is about 3.8G in size.
to do a tail -f file.txt is not very useful, however, each batch of transactions begins with:
START TRANSACTION: xyz
and there are only a couple hundred of those.
Is there any way to combine tail -f and grep "START TRANSACTION:" in such a way to get the following output:
START TRANSACTION: abc
START TRANSACTION: def
START TRANSACTION: ghi
...
dynamically?
Reading the SO question you linked, it seems like:
tail -f -n +1 file.txt | grep "START TRANSACTION"
should do what you want. The -n option tells tail how many lines to output (if given a plain number); if instead given a number starting with +, it starts from that line. So that'll start from the first line.
tail -fintogrep?tail -f file | grep ...and look at e.g. stackoverflow.com/questions/7161821/… if you get buffering issues