permissions

zeynep · 01-20-2008, 05:56 AM

hello,
how i can list
under the
/bin directory folders and users who have permissions of read

pixellany · 01-20-2008, 06:13 AM

"ls -l" gives you the complete information on files and folders (directories). Permissions are arranged in three categories: Owner, Group, and others. If the third group has an "r" then everyone has read permission.

For the group category, you also need to know who is in the group. For that, look at /etc/group. Suppose the groupname for the file or directory is "bozos": enter "cat /etc/group|grep bozos"

zeynep · 01-20-2008, 07:32 AM

I first made
ls -al
i saw the whole list but a lof of folder exist who have permissions of read after grep should i write one by one folder names?

bigrigdriver · 01-20-2008, 09:12 AM

ls -alR will show you a recursive list (shows directories and sub-directories).

pixellany · 01-20-2008, 11:19 AM

Quote:

Originally Posted by zeynep

I first made
ls -al
i saw the whole list but a lof of folder exist who have permissions of read after grep should i write one by one folder names?

I don't understand this question. When I suggested using grep to look at the "group" file, the entry after grep was a group name.

Here's a sample of what ls -l produces:
drwxr-xr-x 5 root bin 4096 Aug 31 10:48 cisco-vpnclient/

Translation (partial):
cisco-vpnclient is a directory owned by "root" and assigned to the "bin" group. Permissions are:
owner: full
group: read and execute
others: read and execute

To see who is in the "bin" group, do "cat /etc/group|grep bin"

zeynep · 01-20-2008, 12:23 PM

Thank you now become very clear
after
cat /etc/group |grep bin
some folders listed but still i dont know how i will list read permissions of (not owners or groups) others

pixellany · 01-20-2008, 01:13 PM

The 3rd group in the permissions ("others") means everyone who is not the owner or a group member. You won't find anything on "others" except what shows in the ls -l output.

Look again at the example I posted: the owner (root) has full permissions (rwx), and the group (bin) has read and execute permission (r-x). Everyone else (others) has read and execute permission. "Everyone else" does not need further definition.