An invisible file is one whose first character is the dot or period character (.). UNIX programs (including the shell) use most of these files to store configuration information.Some common examples of hidden files include the files:  


  .profile
the Bourne shell ( sh) initialization script
   .kshrc
the Korn shell ( ksh) initialization script
  .cshrc
the C shell ( csh) initialization script
  .rhosts
the remote shell configuration file







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