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    Your example will fail because the user could compile his own mkdir and rename it, or even just copy and rename the existing binary. Also, there's a shell builtin for overriding aliases and functions. Commented Sep 17, 2013 at 7:05
  • hmm that's correct , so is there anyway ? Commented Sep 17, 2013 at 7:07
  • also user don't need to compile he can easily copy cp /bin/mkdir mkdir2 then use it :( Commented Sep 17, 2013 at 7:08
  • Creating a directory is such a common/fundamental task that there are multiple ways of doing it, and it would be almost impossible to block them all (except by not letting the user create files; i.e., write-protecting all directories against him).  For example, cp -r /usr/local/lib ggg will create a directory called ggg (containing a copy of the contents of /usr/local/lib, if any, which the user can then just delete).  You can use find / -type d -empty to find an empty directory to copy. Commented Aug 21, 2015 at 7:19