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why cant I change this back to 775 ...when i try it stays like this drwsrwsr-x

what is the s and why is it not drwxrwxr-x

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Please don't cross-post. – Dennis Williamson Feb 23 '11 at 2:41
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3 Answers

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The s you are seeing in x position on user and group column is called

suid (for user column) and sugid ( for group column )

bit

You can remove them with chmod ug-s directory

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It's "sgid" (no "u"). – Dennis Williamson Feb 23 '11 at 2:41
"what is the drwsrwsrwx?" <- check again – Hrvoje Špoljar Feb 23 '11 at 11:44
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up vote 8 down vote

setuid and setgid

setuid and setgid (short for set user ID upon execution and set group ID upon execution, respectively) are Unix access rights flags that allow users to run an executable with the permissions of the executable's owner or group. They are often used to allow users on a computer system to run programs with temporarily elevated privileges in order to perform a specific task. While the assumed user id or group id privileges provided are not always elevated, at a minimum they are specific.

Run to delete setuid and setgid:

chmod 0775 path
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It's on directory not file – Hrvoje Špoljar Feb 23 '11 at 1:34
a directory is also a file in a unix filesystem, what ooshro says is completely correct – lynxman Feb 23 '11 at 1:35
yes it's all a file, but the description does not fit as you dont execute something that looks like drwxrwxr-x :| – Hrvoje Špoljar Feb 23 '11 at 1:37
In unix, the inode is the thing that gets the permissions. – chris Feb 25 '11 at 2:48
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up vote 1 down vote

Adding to ooshro's answer...

If you use suid or sgid permissions on a directory, any files created inside that directory will have the same owner (if suid) or group (sgid) as the directory in question.

I use that for my home Samba share. The base directory is owned by user nobody and group olympia, and the permissions are 2770. So you have to be in the group olympia to read or write anything below that directory, and it will make sure olympia is the owning group of everything below it. I also have Samba configured to use a dirmask of 2770 and a filemask of 660 to keep the permissions correct all the way down the tree.

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