Linux Bird's private cuisine (third edition) reading notes

Sixth chapter

1. Users, user groups, other people
2. Permissions: Read R, write W, execute X
3. CHGRP: Changing the user group to which the file belongs
4. Chown: Change the user who owns the file
5. CHOMD: Changing the permissions of a file
6. The method of modifying permissions with numbers, xyz three digits corresponding to the user, user group, other
7. The method of modifying permissions with letters, u on behalf of user, G for user group, O for other, a for all. + Add a permission,-remove a permission, = set a permission

Seventh Chapter

1. CD switch directory, PWD display the current directory, mkdir create a new directory, rmdir delete an empty directory
2. PATH environment variable
3. LS Viewing files and directories
4. CP, RM, MV
5. CP copied files, the file owner is usually the command operator itself
6. BaseName get the filename from the path, dirname get the directory name from the path
7. Cat, TAC, NL, more, less, head, tail, OD
8. Touch modify file time or create a new file

Linux Bird's private cuisine (third edition) reading notes