20 lines
826 B
Markdown
20 lines
826 B
Markdown
We are aware of permissions for the owner(u), group(g), and other(o), however
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the set-uid, set-gid and sticky bit are other special permissions.
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| setting | description |
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| ------ | ----------- |
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| set-uid | setting uid on an executable file allows the file to be executed
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with the original owners permissions.e.g.A script owned by root is executed
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with root priviledges when run by an ordinary user|
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|set-gid | in files, set-gid files are executed with the group's permissions,
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while in directories all new files belong to the group by default|
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|sticky bit | In a shared environment, allows deletion only by the owner of the
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file|
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```
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chmod u+s file # sets uid, use - to unset
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chmod g+s directory # sets gid
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chmod +t # sets the sticky bit
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chmod 1770 directory # sets sticky bit, grants rwx permissions for u and g
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```
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