"Shorthand" suggests %C will yield the same as %l%h%p%r. Stating
that it's in fact a hashed version (SHA1) of it without being too
precise makes things clearer, especially for readers of the ControlPath
bits:
It is recommended that any ControlPath [...] include at least
%h, %p, and %r (or alternatively %C) [...]. This ensures that
shared connections are uniquely identified.
That way %C will make more sense with regard to unique socket names.
Feedback?
diff --git a/usr.bin/ssh/ssh_config.5 b/usr.bin/ssh/ssh_config.5
index eab8dd01c22..94bc5cef731 100644
--- a/usr.bin/ssh/ssh_config.5
+++ b/usr.bin/ssh/ssh_config.5
@@ -1683,7 +1683,7 @@ which are expanded at runtime:
A literal
.Sq % .
.It \&%C
-Shorthand for %l%h%p%r.
+Hash of %l%h%p%r.
.It %d
Local user's home directory.
.It %h
