which - look for a file called name
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   which [-h] <file_name>

   Looks  for  a  file in a set of directories which includes the current
   directory as well as those in the VIS path. If it finds it, it reports the
   path. The path is specified through the "set open_path" command in the
   .visrc.

   Command options:

   -h
          Print the command usage.

   <file_name>
          File to be searched
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   Last updated on 20100410 00h02