[Tutor] Permissions oddness

[dman]

On Sun, Jan 13, 2002 at 09:13:15PM -0500, Michael P. Reilly wrote:
| On Sun, Jan 13, 2002 at 08:14:18PM -0500, dman wrote:
| > For directories :
| >     Read means you can list the contents.
| >     Write means you can modify the contents.
| >     Execute means you can 'cd' to the directory.
| 
| FYI, the execute bit on a directory means more than just 'can you cd'.
| It allows a program to traverse into the directory to open files.
| Try this:
| 
| import os
| os.mkdir('trythis', 0777)
| open('trythis/test.txt', 'w').write('hi there\n')
| 
| os.chmod('trythis', 0666)
| f = open('trythis/test.txt', 'r')
| 
| At this point, you'll get an exception of "Permission denied".  We're not
| changing the current directory, just trying to access a file in it.

Ok, right, you're trying to descend into the directory.  I guess
that's a better way to phrase it.

-D

-- 

"...the word HACK is used as a verb to indicate a massive amount
of nerd-like effort."  -Harley Hahn, A Student's Guide to Unix