Add a -L option to wc(1), for finger compatibility with the GNU

wc utility.  The -L option can be used to report the length of
the longest line wc has seen in one or more files.  It is
disabled by default, and wc uses the standard `-lwc'.

Submitted by:	Sheldon Givens, sheldon at sigsegv.ca
Reviewed by:	kib
MFC after:	1 week

1 files changed, 25 insertions, 2 deletions

diff --git a/usr.bin/wc/wc.1 b/usr.bin/wc/wc.1
index eeaaa74..2e8ac2d 100644
--- a/usr.bin/wc/wc.1
+++ b/usr.bin/wc/wc.1
@@ -35,7 +35,7 @@
 .\"     @(#)wc.1	8.2 (Berkeley) 4/19/94
 .\" $FreeBSD$
 .\"
-.Dd February 23, 2005
+.Dd December 6, 2008
 .Dt WC 1
 .Os
 .Sh NAME
@@ -43,7 +43,7 @@
 .Nd word, line, character, and byte count
 .Sh SYNOPSIS
 .Nm
-.Op Fl clmw
+.Op Fl Lclmw
 .Op Ar
 .Sh DESCRIPTION
 The
@@ -71,6 +71,15 @@ the last file.
 .Pp
 The following options are available:
 .Bl -tag -width indent
+.It Fl L
+The number of characters in the longest input line
+is written to the standard output.
+When more then one
+.Ar file
+argument is specified, the longest input line of
+.Em all
+files is reported as the value of the final
+.Dq total .
 .It Fl c
 The number of bytes in each input file
 is written to the standard output.
@@ -129,6 +138,10 @@ and
 as well as the totals for both:
 .Pp
 .Dl "wc -mlw report1 report2"
+.Pp
+Find the longest line in a list of files:
+.Pp
+.Dl "wc -L file1 file2 file3 | fgrep total"
 .Sh COMPATIBILITY
 Historically, the
 .Nm
@@ -154,6 +167,16 @@ in terms of the
 .Xr iswspace 3
 function, as required by
 .St -p1003.2 .
+.Pp
+The
+.Fl L
+option is a non-standard
+.Fx
+extension, compatible with the
+.Fl L
+option of the GNU
+.Nm
+utility.
 .Sh SEE ALSO
 .Xr iswspace 3
 .Sh STANDARDS