131 lines
3.9 KiB
Plaintext
131 lines
3.9 KiB
Plaintext
.\" This module is believed to contain source code proprietary to AT&T.
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.\" Use and redistribution is subject to the Berkeley Software License
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.\" Agreement and your Software Agreement with AT&T (Western Electric).
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.\"
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.\" @(#)tt05 8.1 (Berkeley) 6/8/93
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.\" Copyright (C) Caldera International Inc. 2001-2002. All rights reserved.
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.\"
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.\" Redistribution and use in source and binary forms, with or without
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.\" modification, are permitted provided that the following conditions are
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.\" met:
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.\"
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.\" Redistributions of source code and documentation must retain the above
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.\" copyright notice, this list of conditions and the following
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.\" disclaimer.
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.\"
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.\" Redistributions in binary form must reproduce the above copyright
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.\" notice, this list of conditions and the following disclaimer in the
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.\" documentation and/or other materials provided with the distribution.
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.\"
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.\" All advertising materials mentioning features or use of this software
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.\" must display the following acknowledgement:
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.\"
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.\" This product includes software developed or owned by Caldera
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.\" International, Inc. Neither the name of Caldera International, Inc.
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.\" nor the names of other contributors may be used to endorse or promote
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.\" products derived from this software without specific prior written
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.\" permission.
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.\"
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.\" USE OF THE SOFTWARE PROVIDED FOR UNDER THIS LICENSE BY CALDERA
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.\" INTERNATIONAL, INC. AND CONTRIBUTORS ``AS IS'' AND ANY EXPRESS OR
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.\" IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
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.\" WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
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.\" DISCLAIMED. IN NO EVENT SHALL CALDERA INTERNATIONAL, INC. BE LIABLE
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.\" FOR ANY DIRECT, INDIRECT INCIDENTAL, SPECIAL, EXEMPLARY, OR
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.\" CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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.\" SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR
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.\" BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
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.\" WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE
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.\" OR OTHERWISE) RISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN
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.\" IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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.\"
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.\" $FreeBSD$
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.\"
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.NH
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Tabs
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.PP
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Tabs
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(the \s8ASCII\s0 `horizontal tab' character)
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can be used to produce output in columns,
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or to set the horizontal position of output.
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Typically
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tabs are used only in unfilled text.
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Tab stops are set by default every half inch from the
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current indent,
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but
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can be changed by the
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.BD .ta
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command.
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To set stops every inch, for example,
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.P1
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^ta 1i 2i 3i 4i 5i 6i
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.P2
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.PP
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Unfortunately the stops are left-justified only
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(as on a typewriter),
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so lining up columns of right-justified numbers can be painful.
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If you have many numbers,
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or if you need more complicated table layout,
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.ul
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don't
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use
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.UL troff
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directly;
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use the
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.UL tbl
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program described in [3].
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.PP
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For a handful of numeric columns, you can do it this way:
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Precede every number by enough blanks to make it line up
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when typed.
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.P1
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^nf
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^ta 1i 2i 3i
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\0\01\0\fItab\fR\0\0\02\0\fItab\fR\0\0\03
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\040\0\fItab\fR\0\050\0\fItab\fR\0\060
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700\0\fItab\fR\0800\0\fItab\fR\0900
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^fi
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.P2
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Then change each leading blank into the string
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.BD \e0 .
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This is a character that does not print, but that has
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the same width as a digit.
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When printed, this will produce
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.P1
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.ta 1i 2i 3i
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\0\01 \0\02 \0\03
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\040 \050 \060
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700 800 900
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.P2
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.PP
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It is also possible to fill up tabbed-over space with
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some character other than blanks by setting the `tab replacement character'
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with the
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.BD .tc
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command:
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.P1
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^ta 1.5i 2.5i
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^tc \e(ru (\e(ru is "\(ru")
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Name \fItab\fR Age \fItab\fR
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.P2
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produces
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.P1 3
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.ta 1.5i 2.5i
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.tc \(ru
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Name Age
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.tc
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.P2
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To reset the tab replacement character to a blank, use
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.BD .tc
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with no argument.
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(Lines can also be drawn with the
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.BD \el
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command, described in Section 6.)
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.PP
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.UL troff
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also provides a very general mechanism called `fields'
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for setting up complicated columns.
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(This is used by
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.UL tbl ).
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We will not go into it in this paper.
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