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06-08-2005, 04:10 AM
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#1
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Member
Registered: Apr 2005
Posts: 37
Rep:
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Permission setting
Hi,
I am familiar with permission format such as x, w, r, but never come across permission s. What is this permission for and what is the value for it if I would like to add the permission using chmod?
Thanks.
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06-08-2005, 04:23 AM
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#2
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Member
Registered: Oct 2004
Location: Belgium
Distribution: Slackware 13.37
Posts: 512
Rep:
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06-08-2005, 04:44 AM
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#3
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Member
Registered: Jan 2005
Posts: 55
Rep:
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Hi Friend
There are 10 parts of permissions
- - - - - - - - - -
r w x r w x r w x
First single part for file or direcoty , if "-" then file , if "d" then directory
- - - Owner's Permission
r w x
- - - Owner's group Permission
r w x
- - - Other's Permission
r w x
If you want to set a permission on a file
You can like this
chmod -rw- rwx r-x janz
Now janz file has following permissions
Owner has r/w [ Read , Write ]Permission
Owner's group has r/w/x [ Read , Write , Execute] Permissions
and others have r/x [ Read , Execute ] Permissions
Ohh i m fed up from typing.
if you found this article useful then reply me.
Thanks
Tulip4Heaven
Graphichorizon.net
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06-08-2005, 07:35 PM
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#4
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Member
Registered: Apr 2005
Posts: 37
Original Poster
Rep:
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Hi,
Thanks for the reply. But, I'm still not clear on what s or S is for and how to set them. For example, it's mentioned that If SUID is set, then "x" in the owner permissions is replaced to "s", if owner has execute permissions, or to "S" otherwise.
-rws------ both owner execute and SUID are set
-r-S------ SUID is set, but owner execute is not set
Then, what s or S actually does and how to set s or S?
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06-08-2005, 09:06 PM
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#5
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Senior Member
Registered: May 2004
Location: In the DC 'burbs
Distribution: Arch, Scientific Linux, Debian, Ubuntu
Posts: 4,290
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The setuid bit causes an executable to be run with the permission of the executable's owner, not the permission of the person executing it. it is used to allow a non priviliged user to run a priviliged command such as passwd, which must manipulate the password database. The setgid bit does the same, but for groups. The capital S means that the setuid/setgid bit is set, but not the underlying executable permission (this is extremely rare). A look at man chmod will tell you how to set/unset these bits.
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