linux tail 与 grep

tail -f ./a.txt


tail -f ./a.txt ./b.txt


tail -f ./*.txt


tail -f ./*.txt | grep --line-buffer 'java'


find -name '*.txt' -print0 | xargs -0 -t  tail -f | grep --line-buffer 'java'


tail -10 ./a.txt


tail +10 ./a.txt