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TABS(1)								       TABS(1)

NAME    [Toc]    [Back]

     tabs - set	tabs on	a terminal

SYNOPSIS    [Toc]    [Back]

     tabs [tabspec] [-Ttype] [+mn]

DESCRIPTION    [Toc]    [Back]

     tabs sets the tab stops on	the user's terminal according to the tab
     specification tabspec, after clearing any previous	settings.  The user's
     terminal must have	remotely-settable hardware tabs.

     tabspec Four types	of tab specification are accepted for tabspec.	They
	     are described below:  canned (-code), repetitive (-n), arbitrary
	     (n1,n2,...), and file (--file).  If no tabspec is given, the
	     default value is -8, i.e.,	UNIX system ``standard'' tabs.	The
	     lowest column number is 1.	 Note that for tabs, column 1 always
	     refers to the leftmost column on a	terminal, even one whose
	     column markers begin at 0,	e.g., the DASI 300, DASI 300s, and
	     DASI 450.

     -code   Use one of	the codes listed below to select a canned set of tabs.
	     The legal codes and their meanings	are as follows:
	     -a	     1,10,16,36,72
		     Assembler,	IBM S/370, first format
	     -a2     1,10,16,40,72
		     Assembler,	IBM S/370, second format
	     -c	     1,8,12,16,20,55
		     COBOL, normal format
	     -c2     1,6,10,14,49
		     COBOL compact format (columns 1-6 omitted).  Using	this
		     code, the first typed character corresponds to card
		     column 7, one space gets you to column 8, and a tab
		     reaches column 12.	 Files using this tab setup should
		     include a format specification as follows (see fspec(4)):
			  <:t-c2 m6 s66	d:>
	     -c3     1,6,10,14,18,22,26,30,34,38,42,46,50,54,58,62,67
		     COBOL compact format (columns 1-6 omitted), with more
		     tabs than -c2. This is the	recommended format for COBOL.
		     The appropriate format specification is (see fspec(4)):
			  <:t-c3 m6 s66	d:>
	     -f	     1,7,11,15,19,23
	     -p	     1,5,9,13,17,21,25,29,33,37,41,45,49,53,57,61
	     -s	     1,10,55
	     -u	     1,12,20,44
		     UNIVAC 1100 Assembler

									Page 1

TABS(1)								       TABS(1)

     -n	     A repetitive specification	requests tabs at columns 1+n, 1+2*n,
	     etc.  Of particular importance is the value 8:  this represents
	     the UNIX system ``standard'' tab setting, and is the most likely
	     tab setting to be found at	a terminal.  Another special case is
	     the value 0, implying no tabs at all.

	     The arbitrary format permits the user to type any chosen set of
	     numbers, separated	by commas, in ascending	order.	Up to 40
	     numbers are allowed.  If any number (except the first one)	is
	     preceded by a plus	sign, it is taken as an	increment to be	added
	     to	the previous value.  Thus, the formats 1,10,20,30, and
	     1,10,+10,+10 are considered identical.

     --file  If	the name of a file is given, tabs reads	the first line of the
	     file, searching for a format specification	(see fspec(4)).	 If it
	     finds one there, it sets the tab stops according to it, otherwise
	     it	sets them as -8.  This type of specification may be used to
	     make sure that a tabbed file is printed with correct tab
	     settings, and would be used with the pr(1)	command:
		  tabs -- file;	pr file

     Any of the	following also may be used; if a given flag occurs more	than
     once, the last value given	takes effect:

     -Ttype  tabs usually needs	to know	the type of terminal in	order to set
	     tabs and always needs to know the type to set margins.  type is a
	     name listed in term(5).  If no -T flag is supplied, tabs uses the
	     value of the environment variable TERM.  If TERM is not defined
	     in	the environment	(see environ(5)), tabs tries a sequence	that
	     will work for many	terminals.

     +mn     The margin	argument may be	used for some terminals.  It causes
	     all tabs to be moved over n columns by making column n+1 the left
	     margin.  If +m is given without a value of	n, the value assumed
	     is	10.  For a TermiNet, the first value in	the tab	list should be
	     1,	or the margin will move	even further to	the right.  The	normal
	     (leftmost)	margin on most terminals is obtained by	+m0.  The
	     margin for	most terminals is reset	only when the +m flag is given

EXAMPLES    [Toc]    [Back]

     tabs -a	  example using	-code (canned specification) to	set tabs to
		  the settings required	by the IBM assembler:  columns 1, 10,
		  16, 36, 72.

     tabs -8	  example of using -n (repetitive specification), where	n is
		  8, causes tabs to be set every eighth	position:
		  1+(1*8), 1+(2*8), ...	which evaluate to columns 9, 17, ...

									Page 2

TABS(1)								       TABS(1)

     tabs 1,8,36  example of using n1,n2,...  (arbitrary specification)	to set
		  tabs at columns 1, 8,	and 36.

     tabs --$HOME/fspec.list/att4425
		  example of using --file (file	specification) to indicate
		  that tabs should be set according to the first line of
		  $HOME/fspec.list/att4425 (see	fspec(4)).

DIAGNOSTICS    [Toc]    [Back]

     illegal tabs	 when arbitrary	tabs are ordered incorrectly
     illegal increment	 when a	zero or	missing	increment is found in an
			 arbitrary specification
     unknown tab code	 when a	canned code cannot be found
     can't open		 if --file option used,	and file can't be opened
     file indirection	 if --file option used and the specification in	that
			 file points to	yet another file.  Indirection of this
			 form is not permitted

NOTES    [Toc]    [Back]

     Hardware tabs must	be enabled on the terminal device by entering the UNIX
     command `stty tabs'; otherwise the	tabs command will appear to have no
     effect.  Tab and margin setting is	performed via the standard output.

     There is no consistency among different terminals regarding ways of
     clearing tabs and setting the left	margin.

     tabs clears only 20 tabs (on terminals requiring a	long sequence),	but is
     willing to	set 64.

WARNING    [Toc]    [Back]

     The tabspec used with the tabs command is different from the one used
     with the newform(1) command.  For example,	tabs -8	sets every eighth
     position; whereas newform -i-8 indicates that tabs	are set	every eighth

SEE ALSO    [Toc]    [Back]

     stty(1), newform(1), pr(1), tput(1), fspec(4), terminfo(4), environ(5),

									PPPPaaaaggggeeee 3333
[ Back ]
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