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TABS(1)								       TABS(1)

NAME
       tabs - set tabs on a terminal

SYNOPSIS
       tabs [-n | −−file
	     [[-code] | -a | -a2 | -c | -c2 | -c3 | -f | -p | -s | -u]]
	     q!! [+m [n]] [-T type]

       tabs [-T type] [+ m [n]] n1 [, n2 ,...]

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

OPTIONS
       The  following  options are supported. If a given flag occurs more than
       once, the last value given takes effect:

       -T type
		   tabs needs to know the type of terminal  in	order  to  set
		   tabs	 and 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 the value of TERM is NULL or TERM is not
		   defined in the  environment	(see  environ(5)),  tabs  uses
		   ansi+tabs  as  the terminal type to provide a sequence that
		   will work for many terminals.

       +m[n]
		   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 explicitly.

   Tab Specification
       Four  types  of	tab  specification  are	 accepted.  They are described
       below:  canned,	repetitive  (-n),  arbitrary  (n1,n2,...),  and	  file
       (-file).

       If  no  tab  specification  is given, the default value is −8, that is,
       UNIX system ``standard'' tabs. The lowest column	 number	 is  1.	 Note:
       For  tabs, column 1 always refers to the leftmost column on a terminal,
       even one whose column markers begin at 0, for example,  the  DASI  300,
       DASI 300s, and DASI 450.

   Canned -code
       Use  one	 of  the codes listed below to select a canned set of tabs. If
       more than one code is specified, the last code  option  will  be	 used.
       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

	      FORTRAN

       -p
	      1,5,9,13,17,21,25,29,33,37,41,45,49,53,57,61

	      PL/I

       -s
	      1,10,55

	      SNOBOL

       -u
	      1,12,20,44

	      UNIVAC 1100 Assembler

   Repetitive
       -n
	      A	 repetitive specification requests tabs at columns 1+n, 1+2*n,
	      etc., where n is a single-digit decimal  number.	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.  When	 −0 is used, the tab stops are
	      cleared and no new ones are set.

   Arbitrary
       See OPERANDS.

   File
       -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  cor‐
		rect tab settings, and would be used with the pr command:

		  example% tabs - file; pr file

       Tab and margin setting is performed via the standard output.

OPERANDS
       The following operand is supported:

       n1[,n2,...]
			     The  arbitrary format consists of tab-stop values
			     separated by commas or spaces. The tab-stop  val‐
			     ues  must be positive decimal integers in ascend‐
			     ing 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 iden‐
			     tical.

EXAMPLES
       Example 1 Using the tabs command

       The following command is an example using -code ( canned specification)
       to set tabs to the settings required by the IBM assembler:  columns  1,
       10, 16, 36, 72:

	 example% tabs -a

       The  next command is an 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, ...:

	 example% tabs −8

       This  command  uses  n1,n2,... (arbitrary specification) to set tabs at
       columns 1, 8, and 36:

	 example% tabs 1,8,36

       The last command is an 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)).

	 example% tabs -$HOME/fspec.list/att4425

ENVIRONMENT VARIABLES
       See environ(5) for descriptions of the following environment  variables
       that affect the execution of tabs: LANG, LC_ALL, LC_CTYPE, LC_MESSAGES,
       and NLSPATH.

       TERM
		Determine the terminal type. If	 this  variable	 is  unset  or
		null,  and  if	the  -T option is not specified, terminal type
		ansi+tabs will be used.

EXIT STATUS
       The following exit values are returned:

       0
	      Successful completion.

       >0
	      An error occurred.

ATTRIBUTES
       See attributes(5) for descriptions of the following attributes:

       ┌────────────────────┬─────────────────┐
       │  ATTRIBUTE TYPE    │ ATTRIBUTE VALUE │
       ├────────────────────┼─────────────────┤
       │CSI		    │ Enabled	      │
       ├────────────────────┼─────────────────┤
       │Interface Stability │ Standard	      │
       └────────────────────┴─────────────────┘

SEE ALSO
       expand(1), newform(1), pr(1), stty(1), tput(1), fspec(4),  terminfo(4),
       attributes(5), environ(5), term(5), standards(5)

NOTES
       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.

       The  tabspec  used with the tabs command is different from the one used
       with the newform command. For example, tabs −8 sets every eighth	 posi‐
       tion;  whereas  newform	−i−8  indicates that tabs are set every eighth
       position.

				  Feb 1, 1995			       TABS(1)
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