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  1. try the 'man man' command, show nothing but END symbol
  2. change to su account
  3. try the 'man man' command again, it works as usual

I have no idea about this problem, any helps? thank you very much.

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  • What is the context? OS? Version? Exact commands?
    – l0b0
    Commented Mar 1, 2012 at 10:58
  • the OS is CentOS release 5.6,
    – tryer3000
    Commented Mar 2, 2012 at 2:03
  • The Context: man command fail to work, but everything is well if i change to super user account. Maybe i modified some login scripts unintentionally, which can cause an access problem.
    – tryer3000
    Commented Mar 2, 2012 at 2:11

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