whence [ -vcwfpamsS ] [ -x num ] name ...
       For each name, indicate how it would be interpreted if used as a
       command name.

       If name is not an alias,  built-in  command,  external  command,
       shell  function,  hashed  command,  or a reserved word, the exit
       status shall be non-zero, and -- if -v, -c, or -w was passed  --
       a  message will be written to standard output.  (This is differ-
       ent from other shells that write that message  to  standard  er-
       ror.)

       whence  is most useful when name is only the last path component
       of a command, i.e. does not include a `/'; in  particular,  pat-
       tern  matching only succeeds if just the non-directory component
       of the command is passed.

       -v     Produce a more verbose report.

       -c     Print the results  in  a  csh-like  format.   This  takes
              precedence over -v.

       -w     For  each  name,  print `name: word' where word is one of
              alias, builtin, command, function,  hashed,  reserved  or
              none,  according  as  name  corresponds  to  an  alias, a
              built-in command, an external command, a shell  function,
              a command defined with the hash builtin, a reserved word,
              or is not recognised.  This takes precedence over -v  and
              -c.

       -f     Causes  the contents of a shell function to be displayed,
              which would otherwise not happen unless the -c flag  were
              used.

       -p     Do  a  path  search  for name even if it is an alias, re-
              served word, shell function or builtin.

       -a     Do a search for all occurrences of  name  throughout  the
              command  path.   Normally  only  the  first occurrence is
              printed.

       -m     The arguments are taken as patterns  (pattern  characters
              should  be  quoted), and the information is displayed for
              each command matching one of these patterns.

       -s     If a pathname contains symlinks, print  the  symlink-free
              pathname as well.

       -S     As  -s, but if the pathname had to be resolved by follow-
              ing  multiple  symlinks,  the  intermediate   steps   are
              printed, too.  The symlink resolved at each step might be
              anywhere in the path.

       -x num Expand tabs when outputting shell functions using the  -c
              option.  This has the same effect as the -x option to the
              functions builtin.

type [ -wfpamsS ] name ...
       Equivalent to whence -v.

where [ -wpmsS ] [ -x num ] name ...
       Equivalent to whence -ca.

which [ -wpamsS ] [ -x num ] name ...
       Equivalent to whence -c.
