tail �R�}���h�Ńt�@�C�����č쐬����Ă��ǂ�������
tail �R�}���h�� "-f" �I�v�V������ "--follow=descriptor" �Ƃ������Ƃ� �Ώۂ̃t�@�C�����č쐬�����ƒǂ��������Ȃ��Ȃ�܂��B
$ tail -f test.txt
���������Ƃ��́A"--follow=name" �� "-F" ���g���܂��B
$ tail -F test.txt
-f, --follow[={name|descriptor}]
output appended data as the file grows;
-f, --follow, and --follow=descriptor are
equivalent
-F same as --follow=name --retry
$ tail -F test.txt Fri Sep 9 12:14:01 JST 2017 Fri Sep 9 12:14:02 JST 2017 tail: 'test.txt' has become inaccessible: No such file or directory tail: 'test.txt' has appeared; following end of new file Fri Sep 9 12:14:12 JST 2017 Fri Sep 9 12:14:13 JST 2017
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