tabs(1)
NAME
tabs - set tabs on a terminal
SYNOPSIS
tabs [options]] [tabstop-list]
DESCRIPTION
The tabs program clears and sets tab-stops on the terminal. This uses
the terminfo clear_all_tabs and set_tab capabilities. If either is
absent, tabs is unable to clear/set tab-stops. The terminal should be
configured to use hard tabs, e.g.,
stty tab0
OPTIONS
General Options
-Tname
Tell tabs which terminal type to use. If this option is not
given, tabs will use the $TERM environment variable. If that is
not set, it will use the ansi+tabs entry.
-d 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.
-n This option tells tabs to check the options and run any debugging
option, but not to modify the terminal settings.
-V reports the version of ncurses which was used in this program, and
exits.
The tabs 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.
Implicit Lists
Use a single number as an option, e.g., "-5" 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 "-0" to clear all tabs.
Use "-8" to set tabs to the standard interval.
Explicit Lists
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.
Predefined Tab-Stops
X/Open defines several predefined lists of tab stops.
-a Assembler, IBM S/370, first format
-a2 Assembler, IBM S/370, second format
-c COBOL, normal format
-c2 COBOL compact format
-c3 COBOL compact format extended
-f FORTRAN
-p PL/I
-s SNOBOL
-u UNIVAC 1100 Assembler
PORTABILITY
IEEE Std 1003.1/The Open Group Base Specifications Issue 7
(POSIX.1-2008) describes a tabs utility. However
* This standard describes a +m option, to set a terminal's left-
margin. Very few of the entries in the terminal database provide
this capability.
* There is no counterpart in X/Open Curses Issue 7 for this utility,
unlike tput(3X).
The -d (debug) and -n (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 terminals 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.
SEE ALSO
tset(1), infocmp(1), ncurses(3NCURSES), terminfo(5). This describes ncurses version 6.0 (patch 20160625). tabs(1)
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