X-Git-Url: http://ncurses.scripts.mit.edu/?a=blobdiff_plain;f=doc%2Fhtml%2Fman%2Fclear.1.html;h=51e563e099f797da7813b29128684b8742bbc00c;hb=b025434573f466efe27862656a6a9d41dd2bd609;hp=5252f61667cc6389c23b94757fe5d80c17acbe5f;hpb=b793748293cd1a764b1a858455399ad899b5a8a1;p=ncurses.git diff --git a/doc/html/man/clear.1.html b/doc/html/man/clear.1.html index 5252f616..51e563e0 100644 --- a/doc/html/man/clear.1.html +++ b/doc/html/man/clear.1.html @@ -1,6 +1,6 @@ @@ -34,15 +34,15 @@
- +-clear(1) clear(1) +clear(1) General Commands Manual clear(1) @@ -52,7 +52,7 @@
- clear + clear [-Ttype] [-V] [-x]
@@ -67,62 +67,72 @@ 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 unneces- + sary, because the default is taken from the environment variable + TERM. If -T is specified, then the shell variables LINES and COL- + UMNS 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: - exec tput clear + exec tput clear The remainder of the script in each case is a copyright notice. - The ncurses clear command began in 1995 by adapting the original BSD + The ncurses clear command began in 1995 by adapting the original BSD clear command (with terminfo, of course). The E3 extension came later: - o In June 1999, xterm provided an extension to the standard control - sequence for clearing the screen. Rather than clearing just the + 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- + This is documented in XTerm Control Sequences as a feature origi- nating 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, + 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, although it was cited in the Red Hat bug report (#683733) which led to the change. - o Again, a few other terminal developers adopted the feature. But + o Again, a few other terminal developers adopted the feature. But the next relevant step was a change to the clear program in 2013 to incorporate this extension. - o In 2013, the E3 extension was overlooked in tput with the "clear" - parameter. That was addressed in 2016 by reorganizing tput to + o In 2013, the E3 extension was overlooked in tput with the "clear" + parameter. That was addressed in 2016 by reorganizing tput to share its logic with clear and tset. @@ -130,15 +140,15 @@ Neither IEEE Std 1003.1/The Open Group Base Specifications Issue 7 (POSIX.1-2008) nor X/Open Curses Issue 7 documents tset or reset. - The latter documents tput, which could be used to replace this utility - either via a shell script or by an alias (such as a symbolic link) to + The latter documents tput, which could be used to replace this utility + either via a shell script or by an alias (such as a symbolic link) to run tput as clear.
tput(1), terminfo(5) - This describes ncurses version 6.0 (patch 20170520). + This describes ncurses version 6.1 (patch 20191012). @@ -149,6 +159,7 @@