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- * @Id: clear.1,v 1.17 2017/08/19 14:12:50 tom Exp @
+ * @Id: clear.1,v 1.33 2023/07/01 14:23:04 tom Exp @
* these would be fallbacks for DS/DE,
* but groff changed the meaning of the macros.
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-<H1 class="no-header">clear 1</H1>
+<H1 class="no-header">clear 1 2023-07-01 ncurses 6.4 User commands</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> User commands <STRONG><A HREF="clear.1.html">clear(1)</A></STRONG>
</PRE><H2><a name="h2-DESCRIPTION">DESCRIPTION</a></H2><PRE>
- <STRONG>clear</STRONG> clears your screen if this is possible, including its scrollback
- buffer (if the extended "E3" capability is defined). <STRONG>clear</STRONG> looks in
- the environment for the terminal type given by the environment variable
- <STRONG>TERM</STRONG>, and then in the <STRONG>terminfo</STRONG> database to determine how to clear the
- screen.
+ <STRONG>clear</STRONG> clears your terminal's screen if this is possible, including the
+ terminal's scrollback buffer (if the extended "E3" capability is
+ defined). <STRONG>clear</STRONG> looks in the environment for the terminal type given
+ by the environment variable <STRONG>TERM</STRONG>, and then in the <STRONG>terminfo</STRONG> database to
+ determine how to clear the screen.
<STRONG>clear</STRONG> writes to the standard output. You can redirect the standard
output to a file (which prevents <STRONG>clear</STRONG> from actually clearing the
</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 unneces-
- sary, because the default is taken from the environment variable
- <STRONG>TERM</STRONG>.
+ 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:
</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.
The <STRONG>E3</STRONG> extension came later:
- <STRONG>o</STRONG> In June 1999, xterm provided an extension to the standard control
+ <STRONG>o</STRONG> In June 1999, <STRONG>xterm</STRONG> provided an extension to the standard control
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 <STRONG>xterm</STRONG>.
<STRONG>o</STRONG> A few other terminal developers adopted the feature, e.g., PuTTY in
2006.
<STRONG>o</STRONG> 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,
+ Linux change, part of the 3.0 release, did not mention <STRONG>xterm</STRONG>,
although it was cited in the Red Hat bug report (#683733) which led
to the change.
</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>
+ <STRONG><A HREF="tput.1.html">tput(1)</A></STRONG>, <STRONG>xterm(1)</STRONG>, <STRONG><A HREF="terminfo.5.html">terminfo(5)</A></STRONG>.
- This describes <STRONG>ncurses</STRONG> version 6.0 (patch 20170819).
+ This describes <STRONG>ncurses</STRONG> version 6.4 (patch 20230812).
- <STRONG><A HREF="clear.1.html">clear(1)</A></STRONG>
+ncurses 6.4 2023-07-01 <STRONG><A HREF="clear.1.html">clear(1)</A></STRONG>
</PRE>
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