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\xe2\x80\x90
       ent  from  other  shells  that  write  that  message to standard
       error.)

       whence is most useful when name is only the last path  component
       of  a  command, i.e. does not include a `/'; in particular, pat\xe2\x80\x90
       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,
              reserved 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\xe2\x80\x90
              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.
