czCheatSheet

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====== on directory permissions ======

from https://askubuntu.com/questions/862289/difference-between-executable-directory-vs-executable-files

It’s useful to think of a directory just as a file which is a list of file names.

**Read bit** – If set, you can read this list. If you have a directory named books:

  * You can ls books and you’ll get a list of the files it contains (-l won’t work however).
  * You can use command-line completion i.e. touch books/bo+Tab to get books/bookfile.
  * You cannot make books your working directory, cd won’t work.

**Write bit** – You can modify this list names on it. You can only do this if the execute bit is also set.

**Execute bit** – You need this permission if you want to:

  * Have any access to files within the directory.
  * Modify details of the list itself. You can add, rename or delete names on the list, but this also requires write permission on the directory.
Setting the execute bit on a directory does not in any way affect the files themselves, but it does affect your access to them. For instance if you have write and execute access for a directory, you can move, rename and delete files, even if you can’t write into the files themselves.