X-Git-Url: https://ncurses.scripts.mit.edu/?a=blobdiff_plain;f=man%2Fclear.1;h=9748fdd5a3aa29bc8b7092a84267a5abcc23245e;hb=88595a127ec2e56af0875eb04e0f2396d6d121c5;hp=3d2ffd98617b9e8c526da62a20d77384979600be;hpb=0485620c03e69b1b58a6b12e5e45c98415fc7575;p=ncurses.git

diff --git a/man/clear.1 b/man/clear.1
index 3d2ffd98..9748fdd5 100644
--- a/man/clear.1
+++ b/man/clear.1
@@ -1,5 +1,6 @@
 .\"***************************************************************************
-.\" Copyright (c) 1998-2016,2017 Free Software Foundation, Inc.              *
+.\" Copyright 2018-2022,2023 Thomas E. Dickey                                *
+.\" Copyright 1998-2016,2017 Free Software Foundation, Inc.                  *
 .\"                                                                          *
 .\" Permission is hereby granted, free of charge, to any person obtaining a  *
 .\" copy of this software and associated documentation files (the            *
@@ -26,14 +27,14 @@
 .\" authorization.                                                           *
 .\"***************************************************************************
 .\"
-.\" $Id: clear.1,v 1.17 2017/08/19 14:12:50 tom Exp $
+.\" $Id: clear.1,v 1.29 2023/04/09 08:28:00 tom Exp $
 .TH @CLEAR@ 1 ""
 .\" these would be fallbacks for DS/DE,
 .\" but groff changed the meaning of the macros.
 .de NS
-.ie \n(.sp
+.ie n  .sp
 .el    .sp .5
-.ie \n(.in +4
+.ie n  .in +4
 .el    .in +2
 .nf
 .ft C			\" Courier
@@ -41,41 +42,46 @@
 .de NE
 .fi
 .ft R
-.in -4
+.ie n  .in -4
+.el    .in -2
 ..
 .ie \n(.g .ds `` \(lq
 .el       .ds `` ``
 .ie \n(.g .ds '' \(rq
 .el       .ds '' ''
 .de bP
-.IP \(bu 4
+.ie n  .IP \(bu 4
+.el    .IP \(bu 2
 ..
 .ds n 5
 .SH NAME
-\fB@CLEAR@\fR \- clear the terminal screen
+\fB@CLEAR@\fP \- clear the terminal screen
 .SH SYNOPSIS
-\fB@CLEAR@\fR [\fB\-T\fR\fItype\fR] [\fB\-V\fP] [\fB\-x\fP]
+\fB@CLEAR@\fR [\fB\-T\fItype\fR] [\fB\-V\fR] [\fB\-x\fR]
 .br
 .SH DESCRIPTION
-\fB@CLEAR@\fR clears your screen if this is possible,
-including its scrollback buffer (if the extended \*(``E3\*('' capability is defined).
-\fB@CLEAR@\fR looks in the environment for the terminal type
+\fB@CLEAR@\fP clears your terminal's screen if this is possible,
+including the terminal's scrollback buffer
+(if the extended \*(``E3\*('' capability is defined).
+\fB@CLEAR@\fP looks in the environment for the terminal type
 given by the environment variable \fBTERM\fP,
 and then in the
-\fBterminfo\fR database to determine how to clear the screen.
+\fBterminfo\fP database to determine how to clear the screen.
 .PP
-\fB@CLEAR@\fR writes to the standard output.
+\fB@CLEAR@\fP writes to the standard output.
 You can redirect the standard output to a file (which prevents
-\fB@CLEAR@\fR from actually clearing the screen),
+\fB@CLEAR@\fP from actually clearing the screen),
 and later \fBcat\fP the file to the screen, clearing it at that point.
 .SH OPTIONS
 .PP
 .TP 5
 .B \-T \fItype\fP
-indicates the \fItype\fR of terminal.
+indicates the \fItype\fP of terminal.
 Normally this option is
 unnecessary, because the default is taken from the environment
-variable \fBTERM\fR.
+variable \fBTERM\fP.
+If \fB\-T\fP is specified, then the shell
+variables \fBLINES\fP and \fBCOLUMNS\fP will also be ignored.
 .TP
 .B \-V
 reports the version of ncurses which was used in this program, and exits.
@@ -111,7 +117,7 @@ BSD \fBclear\fP command (with terminfo, of course).
 .PP
 The \fBE3\fP extension came later:
 .bP
-In June 1999, xterm provided an extension to the standard control
+In June 1999, \fBxterm\fP provided an extension to the standard control
 sequence for clearing the screen.
 Rather than clearing just the visible part of the screen using
 .NS
@@ -124,17 +130,18 @@ printf '\\033[\fB3\fPJ'
 .NE
 .IP
 This is documented in \fIXTerm Control Sequences\fP as a feature originating
-with xterm.
+with \fBxterm\fP.
 .bP
 A few other terminal developers adopted the feature, e.g., PuTTY in 2006.
 .bP
 In April 2011, a Red Hat developer submitted a patch to the Linux
 kernel, modifying its console driver to do the same thing.
-The Linux change, part of the 3.0 release, did not mention xterm,
+The Linux change, part of the 3.0 release, did not mention \fBxterm\fP,
 although it was cited in the Red Hat bug report (#683733)
 which led to the change.
 .bP
-Again, a few other terminal developers adopted the feature.  But the
+Again, a few other terminal developers adopted the feature.
+But the
 next relevant step was a change to the \fBclear\fP program in 2013
 to incorporate this extension.
 .bP
@@ -150,7 +157,9 @@ The latter documents \fBtput\fP, which could be used to replace this utility
 either via a shell script or by an alias (such as a symbolic link) to
 run \fB@TPUT@\fP as \fB@CLEAR@\fP.
 .SH SEE ALSO
-\fB@TPUT@\fR(1), \fBterminfo\fR(\*n)
+\fB@TPUT@\fP(1),
+\fBxterm\fP(1),
+\fBterminfo\fP(\*n).
 .PP
-This describes \fBncurses\fR
+This describes \fBncurses\fP
 version @NCURSES_MAJOR@.@NCURSES_MINOR@ (patch @NCURSES_PATCH@).