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 different 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, pattern
       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 prece-
              dence 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 com-
              mand, an external command, a shell function, a  command  de-
              fined  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 com-
              mand path.  Normally only the first occurrence  is  printed.
              When  combined  with -m, only names appearing in the command
              hash table are searched, but all occurrences of those  names
              are printed.

       -m     The  arguments  are  taken  as  patterns (pattern characters
              should be quoted), and the information is displayed for each
              entry in the command hash table matching one of  these  pat-
              terns.  The hash table is first refilled, in case of changes
              to PATH.

       -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  following
              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 op-
              tion.   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.
