X-Git-Url: https://ncurses.scripts.mit.edu/?a=blobdiff_plain;f=doc%2Fhtml%2Fman%2Fclear.1.html;h=f76da4661c269531ec6c29b34f3edbf6ecbbdcdb;hb=62ca6190a9a8ddccb2c4d5ca7b2ef9f88432da65;hp=21cf34f05a1f249d02bd9c812793f0fc075dfeec;hpb=a3725e39272393790e32a083fd7391aad607828d;p=ncurses.git diff --git a/doc/html/man/clear.1.html b/doc/html/man/clear.1.html index 21cf34f0..f76da466 100644 --- a/doc/html/man/clear.1.html +++ b/doc/html/man/clear.1.html @@ -1,6 +1,6 @@ @@ -45,18 +47,15 @@ - -
+
clear - clear the terminal screen --
+
clear --
+
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 @@ -67,11 +66,76 @@ present. --
+
+ 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 which calls tput clear, e.g., + /usr/bin/tput ${1:+-T$1} clear 2> /dev/null + exit + + 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 + + The remainder of the script in each case is a copyright + notice. + + 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 stan- + dard control sequence for clearing the screen. Rather + than clearing just the visible part of the screen + using + printf '\033[2J' + + one could clear the scrollback using + printf '\033[3J' + + 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, 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 the next relevant step was a change to + the clear program in 2013 to incorporate this exten- + sion. + + 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. + + +
+ Neither IEEE Std 1003.1/The Open Group Base Specifica- + tions 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 run tput as clear. + + +
tput(1), terminfo(5) - This describes ncurses version 6.0 (patch 20150905). + This describes ncurses version 6.0 (patch 20161224). @@ -82,6 +146,8 @@