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Shell course summary

2022-08-09 14:47:00 【Palm nine】

case and loop
1. Write a menu to list the following contents respectively:
(1) Display the contents of the directory;
(2) Switch the directory;
(3) Create a file;
(4) Edit a file;
(5) The function of deleting a file prompts the user to input the directory name and file name from the keyboard;
2. Realize the nine-nine multiplication table;
3. Loop to judge the grade;
4. Loop to judge whether a character input is a number or a letter.

Task one:

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Task two:

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Task three:

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Task four:
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