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If I use
tail -f *filename*
I get a real nice display of whatever is changing in a given file. However, sometimes I want to be able to search this text or otherwise look it over slowly.
Is there any way I can output just the changes to a log file between now and, say, whenever I hit Ctrl-C?
This should output everything that goes by into output.txt, if that's what you're asking for:
tail -f filename | tee output.txt
Use Less's “tail mode”: run less filename, press F (“forward forever”) to scroll to the end of the file and keep reading when the file grows (like tail -f). Press Ctrl+C to drop out of tail mode and use the usual Less commands.
