Index: head/usr.bin/tput/tput.1
===================================================================
--- head/usr.bin/tput/tput.1	(revision 364130)
+++ head/usr.bin/tput/tput.1	(revision 364131)
@@ -1,154 +1,179 @@
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 .\" modification, are permitted provided that the following conditions
 .\" are met:
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 .\"    notice, this list of conditions and the following disclaimer.
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 .\"    may be used to endorse or promote products derived from this software
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 .\"     @(#)tput.1	8.2 (Berkeley) 3/19/94
 .\" $FreeBSD$
 .\"
 .Dd June 15, 2002
 .Dt TPUT 1
 .Os
 .Sh NAME
 .Nm tput ,
 .Nm clear
 .Nd terminal capability interface
 .Sh SYNOPSIS
 .Nm
 .Op Fl T Ar term
-.Ar attribute ...
+.Op Ar attribute ...
 .Nm clear
 .Sh DESCRIPTION
 The
 .Nm
 utility makes terminal-dependent information available to users or shell
 applications.
-When invoked as the
+.Pp
+The
 .Nm clear
-utility, the screen will be cleared as if
+utility executes the
 .Dl tput clear
-had been executed.
-The options to
+command, ignoring any arguments.
+.Pp
+The only option to
 .Nm
-are as follows:
-.Bl -tag -width Ds
+is:
+.Bl -tag -width 2n
 .It Fl T
 The terminal name as specified in the
 .Xr termcap 5
 database, for example,
 .Dq vt100
 or
 .Dq xterm .
 If not specified,
 .Nm
 retrieves the
 .Dq Ev TERM
-variable from the environment.
+variable from the environment unless that too is not specified,
+in which case an error message will be sent to standard error and
+the error status will be 2.
 .El
 .Pp
 The
 .Nm
 utility outputs a string for each
 .Ar attribute
 that is of type string; a number for each of type integer.
 Otherwise,
 .Nm
 exits 0 if the terminal has the capability and 1 if it does not,
 without further action.
 .Pp
 If an
 .Ar attribute
 is of type string, and takes arguments (e.g.\& cursor movement,
 the termcap
 .Dq cm
-sequence) the arguments are taken from the command line immediately
+capability) the arguments are taken from the command line immediately
 following the attribute.
 .Pp
-The following special attributes are available:
+The following special attributes are available.
+The first three use the capabilities of the specified terminal,
+and only work if compatible with the utility's terminal.
 .Bl -tag -width Ar
 .It Cm clear
 Clear the screen (the
 .Xr termcap 5
 .Dq cl
-sequence).
+capability).
 .It Cm init
 Initialize the terminal (the
 .Xr termcap 5
 .Dq is
-sequence).
-.It Cm longname
-Print the descriptive name of the user's terminal type.
+capability).
 .It Cm reset
 Reset the terminal (the
 .Xr termcap 5
 .Dq rs
-sequence).
+capability).
+.It Cm longname
+Print the descriptive name of the user's terminal type.
 .El
+.Sh ENVIRONMENT
+.Bl -tag -width ".Ev TERM"
+.It Ev TERM
+The terminal name, if set and
+.Fl T
+is not used.
+.El
 .Sh EXIT STATUS
 The exit status of
 .Nm
 is as follows:
 .Bl -tag -width indent
 .It 0
-If the last attribute
+If the last
 .Ar attribute
-argument is of type string or integer, its value was successfully written
+is of type string or integer, its value was successfully written
 to standard output.
-If the argument is of type boolean, the terminal has this attribute.
+If the
+.Ar attribute
+is of type boolean, the terminal does have the
+.Ar attribute .
+Otherwise, no
+.Ar attribute
+was specified.
 .It 1
-This terminal does not have the specified boolean
+If the last
+.Ar attribute
+is of type boolean,
+this terminal does not have the
 .Ar attribute .
 .It 2
 Usage error.
+For example, see
+.Fl T
+description.
 .It 3
 No information is available about the specified terminal type.
 .El
 .Sh SEE ALSO
 .Xr termcap 5 ,
 .Xr terminfo 5
 .Sh STANDARDS
 The
 .Nm
 utility conforms to
 .St -p1003.1-2001 .
 .Sh HISTORY
 The
 .Nm
 utility appeared in
 .Bx 4.4 .
 .Sh BUGS
 The
 .Nm
 utility cannot really distinguish between different types of attributes.
 .Pp
 Some termcap entries depend upon having a
 .Sq %
 in them that is just a
 .Sq %
 and nothing more.
 Right now we just warn about them if they do not
 have a valid type declaration.
 These warnings are sent to
 stderr.