chmod u+s FileName

[jestrada101]

What exactly does "chmod u+s FileName" do? Does this allow anyone to execute the script?

thanks
JE

 

[ddrillich]

Use chmod +x FileName to allow anyone to excute the script.

Cheers,
Dan

 

[jestrada101]

what is the difference between the two?

Thanks
JE

 

[tikual]

In your case, chmod u+s is setting a sticky bit. Which is used to prevent file being removed or renamed from a directory. You can say that is file safety.
eg.
ls -l
rw-r--r-- ....... file1
chmod u+s file1
ls -l
rwsr--r-- ....... file1

If anyone want to delete the file, one or more conditions must be met for a user to delete file.
1. user own the file.
2. user own the directory
3. user can write the file.
4. root privilege.

chmod +x is used to enable the executable right to all users.

So, the first one related to file safety and the second one related to file accessibility.

tikual

 

[dchoulette]

Well, I think

chmod u+s

set the set user id bit and not the sticky bit (set by

chmod +t

).
It means that any user executing FileName will have the file owner id as effective user id (only during the execution).
The user must also have right to execute the file. (

rwsr-xr-x

)

"When all else has failed, read the manuals."

Denis

 

[jestrada101]

Thanks all. You have answered my query.