Section: User Commands (1)
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tabs - set tabs on a terminal
tabs [options]] [tabstop-list]
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.,
Like clear(1), tabs writes to the standard output.
You can redirect the standard output to a file (which prevents
tabs from actually changing the tabstops),
and later cat the file to the screen, setting tabstops at that point.
Tell tabs which terminal type to use.
If this option is not given, tabs will use the $TERM
If that is not set, it will use the ansi+tabs entry.
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.
This option tells tabs to check the options and run any debugging
option, but not to modify the terminal settings.
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.
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.
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
Use a ``+'' to treat a number as an increment relative to the previous value,
which is equivalent to the 1,6,11,16,21 example.
X/Open defines several predefined lists of tab stops.
Assembler, IBM S/370, first format
Assembler, IBM S/370, second format
COBOL, normal format
COBOL compact format
COBOL compact format extended
UNIVAC 1100 Assembler
IEEE Std 1003.1/The Open Group Base Specifications Issue 7 (POSIX.1-2008) describes
a tabs utility. However
.IP • 4
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.
.IP • 4
There is no counterpart in X/Open Curses Issue 7 for this utility,
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.
This describes ncurses
version 6.1 (patch 20180127).
- General Options
- Implicit Lists
- Explicit Lists
- Predefined Tab-Stops
- SEE ALSO
This document was created by
using the manual pages.
Time: 09:21:03 GMT, September 26, 2018