permissions of a directory

smehra · #1 (**permalink**) 06-04-2006

Read and write bits make sense for a directory but what about the execute permission bit

What does that imply?Is it just a filler?

Saurabh

cbkihong · #2 (**permalink**) 06-04-2006

With a directory 'x' bit set, that means the user may enter the directory.

amro1 · #3 (**permalink**) 06-04-2006

X means ability to read the file descriptor for the directory. Directory is a special kind of file that stores names of files and it includes pointer to i-nodes on the disk where these files are stored. There is also special meaning for "sticky" bit for directories. It prohibits deletion of the files associated with other users and it is useful in shared directories as /tmp for example.
Get "UNIX essentials and UNIX Core" DVD as it explains all this stuff very well.

ranj@chn · #4 (**permalink**) 06-04-2006

Read the detailed explanation by Perderabo - File permissions

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