ncurses 6.3 - patch 20220219

[ncurses.git] / man / tabs.1

diff --git a/man/tabs.1 b/man/tabs.1
index 822e677b975a708fcd0d1f4e3c47e33aad93e88a..84c6b22e880c2d0b24f8d249d441bed34772619c 100644 (file)
--- a/man/tabs.1
+++ b/man/tabs.1
@@ -27,7 +27,7 @@
 .\" authorization.                                                           *
 .\"***************************************************************************
 .\"
 .\" authorization.                                                           *
 .\"***************************************************************************
 .\"

-.\" $Id: tabs.1,v 1.30 2021/10/09 23:48:50 tom Exp $
+.\" $Id: tabs.1,v 1.35 2021/12/25 19:04:39 tom Exp $

 .TH @TABS@ 1 ""
 .ds n 5
 .ie \n(.g .ds `` \(lq
 .TH @TABS@ 1 ""
 .ds n 5
 .ie \n(.g .ds `` \(lq


@@ -53,22 +53,22 @@
 .el    .in -2
 ..
 .SH NAME
 .el    .in -2
 ..
 .SH NAME

-\fB@TABS@\fR \- set tabs on a terminal
+\fB@TABS@\fP \- set tabs on a terminal

 .SH SYNOPSIS
 .SH SYNOPSIS

-\fB@TABS@\fR [\fIoptions\fR]] \fI[tabstop-list]\fR
+\fB@TABS@\fP [\fIoptions\fP]] \fI[tabstop-list]\fP

 .SH DESCRIPTION
 .PP
 The \fB@TABS@\fP program clears and sets tab-stops on the terminal.
 .SH DESCRIPTION
 .PP
 The \fB@TABS@\fP program clears and sets tab-stops on the terminal.

-This uses the terminfo \fIclear_all_tabs\fP and \fIset_tab\fP capabilities.
+This uses the terminfo \fBclear_all_tabs\fP and \fBset_tab\fP capabilities.

 If either is absent, \fB@TABS@\fP is unable to clear/set tab-stops.
 The terminal should be configured to use hard tabs, e.g.,
 .NS
 stty tab0
 .NE
 .PP
 If either is absent, \fB@TABS@\fP is unable to clear/set tab-stops.
 The terminal should be configured to use hard tabs, e.g.,
 .NS
 stty tab0
 .NE
 .PP

-Like \fB@CLEAR@\fR(1), \fB@TABS@\fR writes to the standard output.
+Like \fB@CLEAR@\fP(1), \fB@TABS@\fP writes to the standard output.

 You can redirect the standard output to a file (which prevents
 You can redirect the standard output to a file (which prevents

-\fB@TABS@\fR from actually changing the tabstops),
+\fB@TABS@\fP from actually changing the tabstops),

 and later \fBcat\fP the file to the screen, setting tabstops at that point.
 .PP
 These are hardware tabs, which cannot be queried rapidly by applications
 and later \fBcat\fP the file to the screen, setting tabstops at that point.
 .PP
 These are hardware tabs, which cannot be queried rapidly by applications


@@ -104,7 +104,7 @@ The second data line shows the actual tab-stops, marked with asterisks.
 This option tells \fB@TABS@\fP to check the options and run any debugging
 option, but not to modify the terminal settings.
 .TP
 This option tells \fB@TABS@\fP to check the options and run any debugging
 option, but not to modify the terminal settings.
 .TP

-\fB\-V\fR
+\fB\-V\fP

 reports the version of ncurses which was used in this program, and exits.
 .PP
 The \fB@TABS@\fP program processes a single list of tab stops.
 reports the version of ncurses which was used in this program, and exits.
 .PP
 The \fB@TABS@\fP program processes a single list of tab stops.


@@ -190,7 +190,7 @@ UNIVAC 1100 Assembler
 A few terminals provide the capability for changing their left/right margins.
 The @TABS@ program has an option to use this feature:
 .TP 5
 A few terminals provide the capability for changing their left/right margins.
 The @TABS@ program has an option to use this feature:
 .TP 5

-.BI \+m \ margin
+.BI +m \ margin

 The effect depends on whether the terminal has the margin capabilities:
 .RS
 .bP
 The effect depends on whether the terminal has the margin capabilities:
 .RS
 .bP


@@ -204,7 +204,7 @@ The terminal's left-margin is not modified.
 .RE
 .IP
 If the \fImargin\fP parameter is omitted, the default is 10.
 .RE
 .IP
 If the \fImargin\fP parameter is omitted, the default is 10.

-Use \fB\+m0\fP to reset the left margin,
+Use \fB+m0\fP to reset the left margin,

 i.e., to the left edge of the terminal's display.
 Before setting a left-margin,
 @TABS@ resets the margin to reduce problems which might arise
 i.e., to the left edge of the terminal's display.
 Before setting a left-margin,
 @TABS@ resets the margin to reduce problems which might arise


@@ -239,17 +239,28 @@ That option is not documented by POSIX.
 .PP
 The PWB/Unix \fBtabs\fP utility, which was included in System III (1980),
 used built-in tables rather than the terminal database,
 .PP
 The PWB/Unix \fBtabs\fP utility, which was included in System III (1980),
 used built-in tables rather than the terminal database,

-to support a half-dozen terminal types.
+to support a half-dozen hardcopy terminal (printer) types.

 It also had built-in logic to support the left-margin,
 as well as a feature for copying the tab settings from a file.
 .PP
 Later versions of Unix, e.g., SVr4,
 added support for the terminal database,
 It also had built-in logic to support the left-margin,
 as well as a feature for copying the tab settings from a file.
 .PP
 Later versions of Unix, e.g., SVr4,
 added support for the terminal database,

-but kept the tables, as a fallback.
+but kept the tables to support the printers.

 In an earlier development effort,
 the tab-stop initialization provided by \fBtset\fP (1982)
 and incorporated into \fBtput\fP uses the terminal database,
 .PP
 In an earlier development effort,
 the tab-stop initialization provided by \fBtset\fP (1982)
 and incorporated into \fBtput\fP uses the terminal database,
 .PP

+The \fB+m\fP option was documented
+in the Base Specifications Issue 5 (Unix98, 1997),
+and omitted in Issue 6 (Unix03, 2004) without documenting the rationale,
+though an introductory comment
+\fI\*(``and optionally adjusts the margin\*(''\fP remains,
+overlooked in the removal.
+The documented \fBtabs\fP utility in Issues 6 and later has no mechanism
+for setting margins.
+The \fB+m\fP option in this implementation differs from the feature
+in SVr4 by using terminal capabilities rather than built-in tables.
+.PP

 POSIX documents no limits on the number of tab stops.
 Documentation for other implementations states that there is a limit on the
 number of tab stops
 POSIX documents no limits on the number of tab stops.
 Documentation for other implementations states that there is a limit on the
 number of tab stops


@@ -273,10 +284,10 @@ However, the \fIExplicit Lists\fP described in this manual page
 were implemented in PWB/Unix.
 Those provide the capability of setting abitrary tab stops.
 .SH SEE ALSO
 were implemented in PWB/Unix.
 Those provide the capability of setting abitrary tab stops.
 .SH SEE ALSO

-\fB@INFOCMP@\fR(1M),
-\fB@TSET@\fR(1),
-\fBcurses\fR(3X),
-\fBterminfo\fR(\*n).
+\fB@INFOCMP@\fP(1M),
+\fB@TSET@\fP(1),
+\fBcurses\fP(3X),
+\fBterminfo\fP(\*n).

 .PP
 .PP

-This describes \fBncurses\fR
+This describes \fBncurses\fP

 version @NCURSES_MAJOR@.@NCURSES_MINOR@ (patch @NCURSES_PATCH@).
 version @NCURSES_MAJOR@.@NCURSES_MINOR@ (patch @NCURSES_PATCH@).