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: : : : 3개의 차이점을 알고 싶습니다. : : : : .bash_profile을 편집하고 . .bash_profile을 하라고 : : : : 하는데 왜 해야하는지요? : : : : /etc/profile을 편집하고 source /etc/profile을 하라고 하는데 : : : : 왜 해야하는지요? : : : : 그리고 어떤 file을 편집하고 sync를 하라고 하는데 왜 인지요? : : : : 이 3개의 차이점을 가르쳐 주세요?ㅑ :    : answer: 'sync' writes any data brffered in memory out to disk. :        This can include (but is not limited to) modified superblocks, :          modified inodes, and delayed reads and writes. The must be :          implemented by the kerner; :          The 'sync' program does nothing but exercise the 'syne' system call. : :          The kernel keeps date in memory to avoid doing (relatively slow) :          disk reads and writes. This improves performance, but if the computer :          crashes, doata may be lost or the filesystem corrupted as a result. :          'sync' ensures everything in memory is written to disk. : :        'source'

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