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Old 02-26-2006, 03:24 PM   #1
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chmod help and permissions

Ok so I have a problem with setting specific permissions on one of my partitions.

I have a file system on my second partition that is basically where i keep all my files, its a total of 17 folders and those 17 folder have files and other foilder in it. here is a basic layout

17 folders (APPZ,MP3,Movies,ect.....)
More folders and file withing the above mention files.

So for example the MP3 folder has mp3 files and 3 sub-folders that have more Mp3.

What I want to be able to do is use chmod chgrp chown to set the following permission

755 for all folders

644 for all files

I will set the owner and group to root

this file system is used as a samba share and a ftp diretory eventually i want to manipulate permissions and group , users so i can allow certain users and groups to have access to certain folders.

i have tried using the -R switch in the following matter:

chmod -R 755 backups\ <-- but this makes files and folder 755 permissions

so after wards i have to go in and do

chmod -R 644 *.* < but i have to go into every single directory and do this which sucks when i have to do changes to all files.

Is there a easy way to do this?

thanks in advance.
Old 02-26-2006, 03:41 PM   #2
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chmod -R u=rwX,go=rX ...

Old 02-26-2006, 06:46 PM   #3
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That worked like a charm! Thanks very much now i just have to play around with it and figure out the sweet spot. Im guessing that letter permissions are more flexible than number ones? Thanks very much again
Old 02-26-2006, 07:16 PM   #4
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Yes, the letter permissions are more flexible. With the letters you can use + and - to change part of the permissions as well as = to set an absolute value. The numeric form is an absolute value only.
Old 02-27-2006, 02:43 AM   #5
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Another option is to use a pair of find commands like the ones below.

find top_dir -type d -exec chmod 755 {} \;
Sets the permissions on all directories below "top_dir" to 755.

find top_dir -type f -exec chmod 644 {} \;
Likewise, for files, permission 644.

A second tip for you would be to add setGID bit to the directory permissions. This will make any new files/directories in the directory be owned by the same group as the directory itself (kinda like "group inheritance"). This can help you in avoiding unnecessary chgrp's/chown's.
There is no similar trick for setting the owner, though.

Third tip, changing owner and group can be done with 1 command, chown. You don't need to use both chown and chgrp.
chown -R user:group /some/dir/
would change both user and group ownership in one go.


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