指令小技巧

改目錄下所有檔案的屬性

從 Windows 複製過來的檔案預設都會是 0777，對強迫症的人來說，是件很要命的事。但只要執行下面兩行指令就能全部調整正常了：

find . -type d -print -exec chmod 755 {} \;
find . -type f -print -exec chmod 644 {} \;

Chmod change attributes from a file/folder

• chmod 666 means that all users can read and write but cannot execute

• chmod 777 allows all actions for all users

• chmod 744 allows only owner to do all actions; group and other users are allowed only to read

   permission to:  owner      group      other     
                   /¯¯¯\      /¯¯¯\      /¯¯¯\
   octal:            6          6          6
   binary:         1 1 0      1 1 0      1 1 0
   what to permit: r w x      r w x      r w x
  
   binary         - 1: enabled, 0: disabled
  
   what to permit - r: read, w: write, x: execute
  
   permission to  - owner: the user that create the file/folder
                    group: the users from group that owner is member
                    other: all other users
  

查目錄所佔的容量

查目錄或檔案所佔的容量可以使用 du ：

du -sh /path/to/directory

-s 是只 show 整個目錄的容量，-h 是顯示人類習慣看的單位。

只顯示目錄

ls -d */