commit a5632a13a089c628d07e3ea1403253e24e22d0a8
from: Russ Cox <rsc@swtch.com>
date: Fri Sep 01 16:06:22 2017 UTC

9(1): document gotcha with oh-my-zsh

commit - 4a8c0c75ffd40d08837d6937e1e995c68ceb276e
commit + a5632a13a089c628d07e3ea1403253e24e22d0a8
blob - e003eb31740fdceddb0ca70fedac31252073f610
blob + a115260d50662a165fa866e075bdbb48adcfc8b0
--- man/man1/9.1
+++ man/man1/9.1
@@ -125,3 +125,18 @@ $ 9 rc
 .B \*9/bin/u.rc
 .SH SEE ALSO
 .IR intro (1)
+.SH BUGS
+Some shell configurations
+(notably, oh-my-zsh)
+define
+.B 9
+as an alias for
+.B cd
+.BR \-9 ,
+which makes the
+.I 9
+command described here inaccessible.
+In such shells, it is necessary to
+.B unalias
+.B 9
+in your initialization scripts.