ncursesw-morphos/doc/html/man/tabs.1.html
Thomas E. Dickey 5606eb4861 ncurses 6.0 - patch 20161119
+ add check in tic for some syntax errors of delays, as well as use of
  proportional delays for non-line capabilities.
+ document history of the clear program and the E3 extension, prompted
  by various discussions including
  http://unix.stackexchange.com/questions/87469/clearing-the-old-scrollback-buffer
2016-11-20 02:06:40 +00:00

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* @Id: tabs.1,v 1.14 2016/10/22 19:54:35 tom Exp @
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<H1 class="no-header">tabs 1</H1>
<PRE>
<STRONG><A HREF="tabs.1.html">tabs(1)</A></STRONG> <STRONG><A HREF="tabs.1.html">tabs(1)</A></STRONG>
</PRE><H2><a name="h2-NAME">NAME</a></H2><PRE>
<STRONG>tabs</STRONG> - set tabs on a terminal
</PRE><H2><a name="h2-SYNOPSIS">SYNOPSIS</a></H2><PRE>
<STRONG>tabs</STRONG> [<EM>options</EM>]] <EM>[tabstop-list]</EM>
</PRE><H2><a name="h2-DESCRIPTION">DESCRIPTION</a></H2><PRE>
The <STRONG>tabs</STRONG> program clears and sets tab-stops on the termi-
nal. This uses the terminfo <EM>clear</EM><STRONG>_</STRONG><EM>all</EM><STRONG>_</STRONG><EM>tabs</EM> and <EM>set</EM><STRONG>_</STRONG><EM>tab</EM>
capabilities. If either is absent, <STRONG>tabs</STRONG> is unable to
clear/set tab-stops. The terminal should be configured to
use hard tabs, e.g.,
stty tab0
</PRE><H2><a name="h2-OPTIONS">OPTIONS</a></H2><PRE>
</PRE><H3><a name="h3-General-Options">General Options</a></H3><PRE>
<STRONG>-T</STRONG><EM>name</EM>
Tell <STRONG>tabs</STRONG> which terminal type to use. If this option
is not given, <STRONG>tabs</STRONG> will use the <STRONG>$TERM</STRONG> environment
variable. If that is not set, it will use the
<EM>ansi+tabs</EM> entry.
<STRONG>-d</STRONG> The debugging option shows a ruler line, followed by
two data lines. The first data line shows the
expected tab-stops marked with asterisks. The second
data line shows the actual tab-stops, marked with
asterisks.
<STRONG>-n</STRONG> This option tells <STRONG>tabs</STRONG> to check the options and run
any debugging option, but not to modify the terminal
settings.
<STRONG>-V</STRONG> reports the version of ncurses which was used in this
program, and exits.
The <STRONG>tabs</STRONG> program processes a single list of tab stops.
The last option to be processed which defines a list is
the one that determines the list to be processed.
</PRE><H3><a name="h3-Implicit-Lists">Implicit Lists</a></H3><PRE>
Use a single number as an option, e.g., "<STRONG>-5</STRONG>" to set tabs
at the given interval (in this case 1, 6, 11, 16, 21,
etc.). Tabs are repeated up to the right margin of the
screen.
Use "<STRONG>-0</STRONG>" to clear all tabs.
Use "<STRONG>-8</STRONG>" to set tabs to the standard interval.
</PRE><H3><a name="h3-Explicit-Lists">Explicit Lists</a></H3><PRE>
An explicit list can be defined after the options (this
does not use a "-"). The values in the list must be in
increasing numeric order, and greater than zero. They are
separated by a comma or a blank, for example,
tabs 1,6,11,16,21
tabs 1 6 11 16 21
Use a '+' to treat a number as an increment relative to
the previous value, e.g.,
tabs 1,+5,+5,+5,+5
which is equivalent to the 1,6,11,16,21 example.
</PRE><H3><a name="h3-Predefined-Tab-Stops">Predefined Tab-Stops</a></H3><PRE>
X/Open defines several predefined lists of tab stops.
<STRONG>-a</STRONG> Assembler, IBM S/370, first format
<STRONG>-a2</STRONG> Assembler, IBM S/370, second format
<STRONG>-c</STRONG> COBOL, normal format
<STRONG>-c2</STRONG> COBOL compact format
<STRONG>-c3</STRONG> COBOL compact format extended
<STRONG>-f</STRONG> FORTRAN
<STRONG>-p</STRONG> PL/I
<STRONG>-s</STRONG> SNOBOL
<STRONG>-u</STRONG> UNIVAC 1100 Assembler
</PRE><H2><a name="h2-PORTABILITY">PORTABILITY</a></H2><PRE>
IEEE Std 1003.1/The Open Group Base Specifications Issue
7 (POSIX.1-2008) describes a <STRONG>tabs</STRONG> utility. However
<STRONG>o</STRONG> This standard describes a <STRONG>+m</STRONG> option, to set a termi-
nal's left-margin. Very few of the entries in the
terminal database provide this capability.
<STRONG>o</STRONG> There is no counterpart in X/Open Curses Issue 7 for
this utility, unlike <STRONG>tput(1)</STRONG>.
The <STRONG>-d</STRONG> (debug) and <STRONG>-n</STRONG> (no-op) options are extensions not
provided by other implementations.
Documentation for other implementations states that there
is a limit on the number of tab stops. While some termi-
nals may not accept an arbitrary number of tab stops, this
implementation will attempt to set tab stops up to the
right margin of the screen, if the given list happens to
be that long.
</PRE><H2><a name="h2-SEE-ALSO">SEE ALSO</a></H2><PRE>
<STRONG><A HREF="tset.1.html">tset(1)</A></STRONG>, <STRONG><A HREF="infocmp.1m.html">infocmp(1m)</A></STRONG>, <STRONG><A HREF="ncurses.3x.html">curses(3x)</A></STRONG>, <STRONG><A HREF="terminfo.5.html">terminfo(5)</A></STRONG>.
This describes <STRONG>ncurses</STRONG> version 6.0 (patch 20161119).
<STRONG><A HREF="tabs.1.html">tabs(1)</A></STRONG>
</PRE>
<div class="nav">
<ul>
<li><a href="#h2-NAME">NAME</a></li>
<li><a href="#h2-SYNOPSIS">SYNOPSIS</a></li>
<li><a href="#h2-DESCRIPTION">DESCRIPTION</a></li>
<li><a href="#h2-OPTIONS">OPTIONS</a>
<ul>
<li><a href="#h3-General-Options">General Options</a></li>
<li><a href="#h3-Implicit-Lists">Implicit Lists</a></li>
<li><a href="#h3-Explicit-Lists">Explicit Lists</a></li>
<li><a href="#h3-Predefined-Tab-Stops">Predefined Tab-Stops</a></li>
</ul>
</li>
<li><a href="#h2-PORTABILITY">PORTABILITY</a></li>
<li><a href="#h2-SEE-ALSO">SEE ALSO</a></li>
</ul>
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