/usr/share/zsh/help/whence is in zsh-common 5.1.1-1ubuntu2.3.
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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 | whence [ -vcwfpamsS ] [ -x num ] name ...
For each name, indicate how it would be interpreted if used as a
command name.
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,
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-
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.
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