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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 Mar 1 '12 at 10:58
    
the OS is CentOS release 5.6, –  tryer3000 Mar 2 '12 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 Mar 2 '12 at 2:11
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