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 See the UNIX Programmers Manual or via % man csh 

 % rehash
  causes the shell to recompute a table of where commands are
  located.  This is necessary if you add a command to a directory
  in the current shell's search path and wish the shell to find it,
  since otherwise the hashing algorithm may tell the shell that the
  command wasn't in that directory when the hash table was computed.

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