error on running which

[Paulus Tangke Allo]

when I run "which" to locate gzip, it gives a strange
response:
$ which gzip
gzip: Command not found

Why "which" doesn't return the full path of the
program?
i already install which version 1.5.1 and the file is
located under /usr/bin


I also got a problem with "man". I couldn't display
the man pages of all the programs.
$ man gzip
no manual entry for gzip

Does anybody experience the same problem? 


thanks,

Paulus

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