Move pages under tldr, lint run.sh, update docs

tldr/osx/whence

@@ -0,0 +1,29 @@
+---
+syntax: markdown
+tags: [tldr, osx]
+source: https://github.com/tldr-pages/tldr.git
+---
+# whence
+
+> A zsh builtin to indicate how a command would be interpreted.
+> More information: <https://keith.github.io/xcode-man-pages/whence.1.html>.
+
+- Interpret `command`, with expansion if defined as an `alias` (similar to the `command -v` builtin):
+
+`whence "{{command}}"`
+
+- Display type of `command`, with location if defined as a function, or binary (equivalent to the `type` and `command -V` builtins):
+
+`whence -v "{{command}}"`
+
+- Same as above, except display content of shell functions instead of location (equivalent to `which` builtin):
+
+`whence -c "{{command}}"`
+
+- Same as above, but show all occurrences on command path (equivalent to the `where` builtin):
+
+`whence -ca "{{command}}"`
+
+- Search only the `PATH` for `command`, ignoring builtins, aliases or shell functions (equivalent to the `where` command):
+
+`whence -p "{{command}}"`