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- * @Id: clear.1,v 1.16 2016/12/31 16:09:34 tom Exp @
+ * @Id: clear.1,v 1.23 2020/02/02 23:34:34 tom Exp @
* these would be fallbacks for DS/DE,
* but groff changed the meaning of the macros.
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<TITLE>clear 1</TITLE>
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<H1 class="no-header">clear 1</H1>
<PRE>
-<STRONG><A HREF="clear.1.html">clear(1)</A></STRONG>
<STRONG><A HREF="clear.1.html">clear(1)</A></STRONG>
+<STRONG><A HREF="clear.1.html">clear(1)</A></STRONG>
General Commands Manual <STRONG><A HREF="clear.1.html">clear(1)</A></STRONG>
</PRE><H2><a name="h2-SYNOPSIS">SYNOPSIS</a></H2><PRE>
- <STRONG>clear</STRONG>
+ <STRONG>clear</STRONG> [<STRONG>-T</STRONG><EM>type</EM>] [<STRONG>-V</STRONG>] [<STRONG>-x</STRONG>]
</PRE><H2><a name="h2-DESCRIPTION">DESCRIPTION</a></H2><PRE>
screen), and later <STRONG>cat</STRONG> the file to the screen, clearing it at that
point.
- <STRONG>clear</STRONG> ignores any command-line parameters that may be present. The
- analogous "<STRONG>tput</STRONG> clear" has command-line parameters including <STRONG>-T</STRONG> for
- overriding the <STRONG>TERM</STRONG> environment variable.
+
+</PRE><H2><a name="h2-OPTIONS">OPTIONS</a></H2><PRE>
+ <STRONG>-T</STRONG> <EM>type</EM>
+ indicates the <EM>type</EM> of terminal. Normally this option is
+ unnecessary, because the default is taken from the environment
+ variable <STRONG>TERM</STRONG>. If <STRONG>-T</STRONG> is specified, then the shell variables <STRONG>LINES</STRONG>
+ and <STRONG>COLUMNS</STRONG> will also be ignored.
+
+ <STRONG>-V</STRONG> reports the version of ncurses which was used in this program, and
+ exits. The options are as follows:
+
+ <STRONG>-x</STRONG> do not attempt to clear the terminal's scrollback buffer using the
+ extended "E3" capability.
</PRE><H2><a name="h2-HISTORY">HISTORY</a></H2><PRE>
- A <STRONG>clear</STRONG> command appeared in 2.79BSD dated February 24, 1979. Later
+ A <STRONG>clear</STRONG> command appeared in 2.79BSD dated February 24, 1979. Later
that was provided in Unix 8th edition (1985).
- AT&T adapted a different BSD program (<STRONG>tset</STRONG>) to make a new command
- (<STRONG>tput</STRONG>), and used this to replace the <STRONG>clear</STRONG> command with a shell script
+ AT&T adapted a different BSD program (<STRONG>tset</STRONG>) to make a new command
+ (<STRONG>tput</STRONG>), and used this to replace the <STRONG>clear</STRONG> command with a shell script
which calls <STRONG>tput</STRONG> <STRONG>clear</STRONG>, e.g.,
- /usr/bin/tput ${1:+-T$1} clear 2> /dev/null
- exit
+ /usr/bin/tput ${1:+-T$1} clear 2> /dev/null
+ exit
- In 1989, when Keith Bostic revised the BSD <STRONG>tput</STRONG> command to make it sim-
- ilar to the AT&T <STRONG>tput</STRONG>, he added a shell script for the <STRONG>clear</STRONG> command:
+ In 1989, when Keith Bostic revised the BSD <STRONG>tput</STRONG> command to make it
+ similar to the AT&T <STRONG>tput</STRONG>, he added a shell script for the <STRONG>clear</STRONG>
+ command:
- exec tput clear
+ exec tput clear
The remainder of the script in each case is a copyright notice.
sequence for clearing the screen. Rather than clearing just the
visible part of the screen using
- printf '\033[2J'
+ printf '\033[2J'
one could clear the <EM>scrollback</EM> using
- printf '\033[<STRONG>3</STRONG>J'
+ printf '\033[<STRONG>3</STRONG>J'
- This is documented in <EM>XTerm</EM> <EM>Control</EM> <EM>Sequences</EM> as a feature origi-
- nating with xterm.
+ This is documented in <EM>XTerm</EM> <EM>Control</EM> <EM>Sequences</EM> as a feature
+ originating with xterm.
<STRONG>o</STRONG> A few other terminal developers adopted the feature, e.g., PuTTY in
2006.
</PRE><H2><a name="h2-SEE-ALSO">SEE ALSO</a></H2><PRE>
<STRONG><A HREF="tput.1.html">tput(1)</A></STRONG>, <STRONG><A HREF="terminfo.5.html">terminfo(5)</A></STRONG>
- This describes <STRONG>ncurses</STRONG> version 6.0 (patch 20170506).
+ This describes <STRONG>ncurses</STRONG> version 6.2 (patch 20210403).
<li><a href="#h2-NAME">NAME</a></li>
<li><a href="#h2-SYNOPSIS">SYNOPSIS</a></li>
<li><a href="#h2-DESCRIPTION">DESCRIPTION</a></li>
+<li><a href="#h2-OPTIONS">OPTIONS</a></li>
<li><a href="#h2-HISTORY">HISTORY</a></li>
<li><a href="#h2-PORTABILITY">PORTABILITY</a></li>
<li><a href="#h2-SEE-ALSO">SEE ALSO</a></li>
projects / ncurses.git / blobdiff