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