X-Git-Url: http://ncurses.scripts.mit.edu/?p=ncurses.git;a=blobdiff_plain;f=doc%2Fhtml%2Fman%2Fclear.1.html;h=94ba5d55864b3411b8d9d29ddca6c0e661a6f5ba;hp=6d7f427e0aecbcc34222d540d2e6ee36b5b15720;hb=6662c1ccb49cb09d0f2cec2ec6150410a0fd0f7f;hpb=2560bc3dae7f4919060c02c91a593566c908091c diff --git a/doc/html/man/clear.1.html b/doc/html/man/clear.1.html index 6d7f427e..94ba5d55 100644 --- a/doc/html/man/clear.1.html +++ b/doc/html/man/clear.1.html @@ -1,6 +1,7 @@ - @@ -34,15 +35,15 @@
- +-clear(1) clear(1) +clear(1) General Commands Manual clear(1) @@ -52,41 +53,52 @@
- clear + clear [-Ttype] [-V] [-x]
- clear clears your screen if this is possible, including its scrollback - buffer (if the extended "E3" capability is defined). clear looks in - the environment for the terminal type given by the environment variable - TERM, and then in the terminfo database to determine how to clear the - screen. + clear clears your terminal's screen if this is possible, including the + terminal's scrollback buffer (if the extended "E3" capability is + defined). clear looks in the environment for the terminal type given + by the environment variable TERM, and then in the terminfo database to + determine how to clear the screen. clear writes to the standard output. You can redirect the standard output to a file (which prevents clear from actually clearing the screen), and later cat the file to the screen, clearing it at that point. - clear ignores any command-line parameters that may be present. The - analogous "tput clear" has command-line parameters including -T for - overriding the TERM environment variable. + +
+ -T type + indicates the type of terminal. Normally this option is + unnecessary, because the default is taken from the environment + variable TERM. If -T is specified, then the shell variables LINES + and COLUMNS will also be ignored. + + -V reports the version of ncurses which was used in this program, and + exits. The options are as follows: + + -x do not attempt to clear the terminal's scrollback buffer using the + extended "E3" capability.
- A clear command appeared in 2.79BSD dated February 24, 1979. Later + A clear 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 (tset) to make a new command - (tput), and used this to replace the clear command with a shell script + AT&T adapted a different BSD program (tset) to make a new command + (tput), and used this to replace the clear command with a shell script which calls tput clear, 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 tput command to make it sim- - ilar to the AT&T tput, he added a shell script for the clear command: + In 1989, when Keith Bostic revised the BSD tput command to make it + similar to the AT&T tput, he added a shell script for the clear + command: - exec tput clear + exec tput clear The remainder of the script in each case is a copyright notice. @@ -95,25 +107,25 @@ The E3 extension came later: - o In June 1999, xterm provided an extension to the standard control + o In June 1999, xterm 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 scrollback using - printf '\033[3J' + printf '\033[3J' - This is documented in XTerm Control Sequences as a feature origi- - nating with xterm. + This is documented in XTerm Control Sequences as a feature + originating with xterm. o A few other terminal developers adopted the feature, e.g., PuTTY in 2006. o 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 xterm, although it was cited in the Red Hat bug report (#683733) which led to the change. @@ -136,9 +148,9 @@
- tput(1), terminfo(5) + tput(1), terminfo(5), xterm(1). - This describes ncurses version 6.0 (patch 20170603). + This describes ncurses version 6.3 (patch 20220724). @@ -149,6 +161,7 @@