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"Brother Bird's Linux private Dish Basic article (Third edition)"--Learning notes __linux

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"Brother Bird's Linux private Dish Basic article (Third edition)"--Learning notes $su, the Pswad that the user defines, is how much. How to view? P322:login Shell and non-login shell, do not understand. P322:~/.bash_profile,~/bash_login,~/.profile, under what circumstances the 3 files were present. Currently on my host, I see only ~/.profile p323: Flowchart p150: Permission issues, can cp/testing/testing testing2/testing2 p193:cp/dir1/file1/dir2 the user to execute CP command, The required permissions. P307: A parent process that executes another bash,exit and then into bash, and this is the 1th bash subprocess.

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