sh: Add support for named character classes in bracket expressions.

Example:
  case x in [[:alpha:]]) echo yes ;; esac

1 files changed, 11 insertions, 1 deletions

diff --git a/bin/sh/sh.1 b/bin/sh/sh.1
index 3b7f3d33462e..67ffcc6bcc25 100644
--- a/bin/sh/sh.1
+++ b/bin/sh/sh.1
@@ -32,7 +32,7 @@
 .\"	from: @(#)sh.1	8.6 (Berkeley) 5/4/95
 .\" $FreeBSD$
 .\"
-.Dd June 12, 2011
+.Dd June 15, 2011
 .Dt SH 1
 .Os
 .Sh NAME
@@ -1648,6 +1648,15 @@ matches a
 rather than introducing a character class.
 A character class matches any of the characters between the square brackets.
 A range of characters may be specified using a minus sign.
+A named class of characters (see
+.Xr wctype 3 )
+may be specified by surrounding the name with
+.Ql \&[:
+and
+.Ql :\&] .
+For example,
+.Ql \&[\&[:alpha:\&]\&]
+is a shell pattern that matches a single letter.
 The character class may be complemented by making an exclamation point
 .Pq Ql !\&
 the first character of the character class.
@@ -2572,6 +2581,7 @@ will return the argument.
 .Xr execve 2 ,
 .Xr getrlimit 2 ,
 .Xr umask 2 ,
+.Xr wctype 3 ,
 .Xr editrc 5
 .Sh HISTORY
 A