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Old 05-29-2016, 02:26 AM   #1
techie_san778
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Exclamation A query regarding sticky bit


Hello Friends,

To add a stick bit to the permissions of a directory, we have to do
$chmod g+t Folder01.
I want to know what is the effect of using t with u and o, i.e. to say,
$chmod u+t Folder01 or $chmod o+t Folder01 ?
I saw that the commands run without any error. But i want to know if there is some other effect than simply protecting the user's files in the directory from deletion from the members of the "Group" and "Others" ?

Regards

Last edited by techie_san778; 05-29-2016 at 03:50 AM.
 
Old 05-29-2016, 04:35 AM   #2
Turbocapitalist
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The +t should have no effect on u and g, but a +s should have an effect. The manual page for "chmod" has a little information about SetGID, SetUID, and the sticky bit. You can watch it with "stat"

Code:
mkdir Folder01

chmod u-s,g-s,o+t Folder01;
stat -c"%a" Folder01;

chmod u-s,g+s,o+t Folder01;
stat -c"%a" Folder01;

chmod u+s,g+s,o+t Folder01;
stat -c"%a" Folder01;
I'm not sure that there is any effect of setting the SetUID bit on a directory, but on a file, especially an executable, you don't want it. It would allow other users to run the file as the owner of the file.

The sticky bit o=t should just protect the files from deletion by others.
 
  


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