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29 .\" $Id: tabs.1,v 1.16 2017/11/18 23:56:00 tom Exp $
54 \fB@TABS@\fR \- set tabs on a terminal
56 \fB@TABS@\fR [\fIoptions\fR]] \fI[tabstop-list]\fR
59 The \fB@TABS@\fP program clears and sets tab-stops on the terminal.
60 This uses the terminfo \fIclear_all_tabs\fP and \fIset_tab\fP capabilities.
61 If either is absent, \fB@TABS@\fP is unable to clear/set tab-stops.
62 The terminal should be configured to use hard tabs, e.g.,
67 Like \fB@CLEAR@\fR(1), \fB@TABS@\fR writes to the standard output.
68 You can redirect the standard output to a file (which prevents
69 \fB@TABS@\fR from actually changing the tabstops),
70 and later \fBcat\fP the file to the screen, setting tabstops at that point.
75 Tell \fB@TABS@\fP which terminal type to use.
76 If this option is not given, \fB@TABS@\fP will use the \fB$TERM\fP
78 If that is not set, it will use the \fIansi+tabs\fP entry.
81 The debugging option shows a ruler line, followed by two data lines.
82 The first data line shows the expected tab-stops marked with asterisks.
83 The second data line shows the actual tab-stops, marked with asterisks.
86 This option tells \fB@TABS@\fP to check the options and run any debugging
87 option, but not to modify the terminal settings.
90 reports the version of ncurses which was used in this program, and exits.
92 The \fB@TABS@\fP program processes a single list of tab stops.
93 The last option to be processed which defines a list is the one that
94 determines the list to be processed.
96 Use a single number as an option, e.g., \*(``\fB\-5\fP\*('' to set tabs at the given
97 interval (in this case 1, 6, 11, 16, 21, etc.). Tabs are repeated up to
98 the right margin of the screen.
100 Use \*(``\fB\-0\fP\*('' to clear all tabs.
102 Use \*(``\fB\-8\fP\*('' to set tabs to the standard interval.
104 An explicit list can be defined after the options
105 (this does not use a \*(``\-\*('').
106 The values in the list must be in increasing numeric order,
107 and greater than zero.
108 They are separated by a comma or a blank, for example,
115 Use a \*(``+\*('' to treat a number as an increment relative to the previous value,
121 which is equivalent to the 1,6,11,16,21 example.
122 .SS Predefined Tab-Stops
123 X/Open defines several predefined lists of tab stops.
126 Assembler, IBM S/370, first format
129 Assembler, IBM S/370, second format
138 COBOL compact format extended
150 UNIVAC 1100 Assembler
153 IEEE Std 1003.1/The Open Group Base Specifications Issue 7 (POSIX.1-2008) describes
154 a \fBtabs\fP utility. However
156 This standard describes a \fB+m\fP option, to set a terminal's left-margin.
157 Very few of the entries in the terminal database provide this capability.
159 There is no counterpart in X/Open Curses Issue 7 for this utility,
160 unlike \fB@TPUT@(1)\fP.
162 The \fB\-d\fP (debug) and \fB\-n\fP (no-op) options are extensions not provided
163 by other implementations.
165 Documentation for other implementations states that there is a limit on the
166 number of tab stops. While some terminals may not accept an arbitrary number
167 of tab stops, this implementation will attempt to set tab stops up to the
168 right margin of the screen, if the given list happens to be that long.
175 This describes \fBncurses\fR
176 version @NCURSES_MAJOR@.@NCURSES_MINOR@ (patch @NCURSES_PATCH@).