Experimenting around directory permissions

by gp 9 years ago

GNU/Linux ◆ xterm ◆ bash 855 views

The POSIX directory permissions are a little tricky at first: in this asciicast I show how to use a prepared Docker image with two configured users to give a try to them.

The x bit in a directory indicates the traversal permission: if you don’t have it you can’t access the content of the directory (i.e. the files).

The r bit is instead the read permission: it allows you to read the directory content, the files contained in it.

The x bit has priority: if you can read the name of the files but cannot traverse the directory, you cannot access the files themself.

The Dockerfile used in this video is here.

The command issued are

$ sudo docker build --tag=gipi/chmod https://gist.githubusercontent.com/gipi/d4b9dbf1ad448b98c973/raw/72209d984826680ed788e3e84e285ee82e554206/Dockerfile
$ sudo docker run -i -t gipi/chmod /bin/bash

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