檔案權限設定
相關指令：chmod / chown / chgrp
[權限代表符號]
r - read
w - write
x - execute
[數值方面]
7 = all rights
6 = read and write
5 = read and execute
4 = read only
3 = execute and write
2 = write only
1 = execute only
w - write
x - execute
[數值方面]
7 = all rights
6 = read and write
5 = read and execute
4 = read only
3 = execute and write
2 = write only
1 = execute only
0 = no rights
更改所有目錄跟檔案屬性範例：
sudo chmod -R 775 *
更改所有包含子目錄的檔案權限，目錄不變更：
sudo find * -type f -exec chmod 664 {} \;
更改所有包含子目錄的目錄權限，目錄不變更：
sudo find * -type d -exec chmod 664 {} \;
參考資料：
https://askubuntu.com/questions/409076/permission-drwxrwxr-x
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