Need a "watching" program

[Vallury Prabhakar]

Hi,

 I was wondering if there is any way of keeping track of any/every body who
 looks around in my home directory?  'twould be nice if this program could
 create and append to a logfile, each time some user chdir-ed to my $HOME.
  
 I'm not a systems hacker so I have no idea what this entails.  My apologies
 if this request sounds ridiculous.  

 Thanks in advance.

						-- Vallury Prabhakar

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