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Unix 第 6 版的 sh 手册和源码，感兴趣请参考`The UNIX Time-Sharing System , CACM, July, 1974，它给出 Shell 操作的理论。 chdir (I), login (I), wait (I), shift (I) -Unix version 6 of sh manuals and source code, please refer interested The Unix Time-Sharing System, CACM, July, 1974, it is Shell operation theory. Chdir (I), login (I), the wait (I), shift (I)
