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+.\" Copyright (c) 2001-2003 The Open Group, All Rights Reserved 
+.TH "TABS" P 2003 "IEEE/The Open Group" "POSIX Programmer's Manual"
+.\" tabs 
+.SH NAME
+tabs \- set terminal tabs
+.SH SYNOPSIS
+.LP
+\fBtabs\fP \fB[\fP \fB-\fP\fIn\fP\fB| -a| -a2| -c| -c2| -c3| -f| -p|
+-s|
+-u\fP\fB][\fP\fB+m\fP\fB[\fP\fIn\fP\fB]]\fP \fB\fP\fB[\fP\fB-T\fP
+\fItype\fP\fB]\fP\fB
+.br
+.sp
+tabs\fP \fB[\fP\fB-T\fP \fItype\fP\fB][\fP \fB+\fP\fB[\fP\fIn\fP\fB]]\fP
+\fIn1\fP\fB[\fP\fB,\fP\fIn2\fP\fB,...\fP\fB]\fP\fB\fP
+\fB
+.br
+\fP
+.SH DESCRIPTION
+.LP
+The \fItabs\fP utility shall display a series of characters that first
+clears the hardware terminal tab settings and then
+initializes the tab stops at the specified positions   \ and optionally
+adjusts the margin. 
+.LP
+The phrase "tab-stop position \fIN\fP" shall be taken to mean that,
+from the start of a line of output, tabbing to position
+\fIN\fP shall cause the next character output to be in the ( \fIN\fP+1)th
+column position on that line. The maximum number of tab
+stops allowed is terminal-dependent.
+.LP
+It need not be possible to implement \fItabs\fP on certain terminals.
+If the terminal type obtained from the \fITERM\fP
+environment variable or \fB-T\fP option represents such a terminal,
+an appropriate diagnostic message shall be written to standard
+error and \fItabs\fP shall exit with a status greater than zero.
+.SH OPTIONS
+.LP
+The \fItabs\fP utility shall conform to the Base Definitions volume
+of IEEE\ Std\ 1003.1-2001, Section 12.2, Utility Syntax Guidelines,
+\ except for
+various extensions: the options \fB-a2\fP, \fB-c2\fP, and \fB-c3\fP
+are multi-character. 
+.LP
+The following options shall be supported:
+.TP 7
+\fB-\fP\fIn\fP
+Specify repetitive tab stops separated by a uniform number of column
+positions, \fIn\fP, where \fIn\fP is a single-digit
+decimal number. The default usage of \fItabs\fP with no arguments
+shall be equivalent to \fBtabs\fP-8. When \fB-0\fP is used,
+the tab stops shall be cleared and no new ones set.
+.TP 7
+\fB-a\fP
+1,10,16,36,72
+.br
+Assembler, applicable to some mainframes. 
+.TP 7
+\fB-a2\fP
+1,10,16,40,72
+.br
+Assembler, applicable to some mainframes. 
+.TP 7
+\fB-c\fP
+1,8,12,16,20,55
+.br
+COBOL, normal format. 
+.TP 7
+\fB-c2\fP
+1,6,10,14,49
+.br
+COBOL, compact format (columns 1 to 6 omitted). 
+.TP 7
+\fB-c3\fP
+1,6,10,14,18,22,26,30,34,38,42,46,50,54,58,62,67
+.br
+COBOL compact format (columns 1 to 6 omitted), with more tabs than
+\fB-c2\fP. 
+.TP 7
+\fB-f\fP
+1,7,11,15,19,23
+.br
+FORTRAN 
+.TP 7
+\fB-p\fP
+1,5,9,13,17,21,25,29,33,37,41,45,49,53,57,61
+.br
+PL/1 
+.TP 7
+\fB-s\fP
+1,10,55
+.br
+SNOBOL 
+.TP 7
+\fB-u\fP
+1,12,20,44
+.br
+Assembler, applicable to some mainframes. 
+.TP 7
+\fB-T\ \fP \fItype\fP
+Indicate the type of terminal. If this option is not supplied and
+the \fITERM\fP variable is unset or null, an unspecified
+default terminal type shall be used. The setting of \fItype\fP shall
+take precedence over the value in \fITERM .\fP
+.sp
+.SH OPERANDS
+.LP
+The following operand shall be supported:
+.TP 7
+\fIn1\fP\fB[\fP,\fIn2\fP,...\fB]\fP
+A single command line argument that consists of tab-stop values separated
+using either commas or <blank>s. The
+application shall ensure that the tab-stop values are positive decimal
+integers in strictly ascending order. 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. For example, the tab
+lists 1,10,20,30 and 1,10,+10,+10 are considered to be identical.
+.sp
+.SH STDIN
+.LP
+Not used.
+.SH INPUT FILES
+.LP
+None.
+.SH ENVIRONMENT VARIABLES
+.LP
+The following environment variables shall affect the execution of
+\fItabs\fP:
+.TP 7
+\fILANG\fP
+Provide a default value for the internationalization variables that
+are unset or null. (See the Base Definitions volume of
+IEEE\ Std\ 1003.1-2001, Section 8.2, Internationalization Variables
+for
+the precedence of internationalization variables used to determine
+the values of locale categories.)
+.TP 7
+\fILC_ALL\fP
+If set to a non-empty string value, override the values of all the
+other internationalization variables.
+.TP 7
+\fILC_CTYPE\fP
+Determine the locale for the interpretation of sequences of bytes
+of text data as characters (for example, single-byte as
+opposed to multi-byte characters in arguments).
+.TP 7
+\fILC_MESSAGES\fP
+Determine the locale that should be used to affect the format and
+contents of diagnostic messages written to standard
+error.
+.TP 7
+\fINLSPATH\fP
+Determine the location of message catalogs for the processing of \fILC_MESSAGES
+\&.\fP 
+.TP 7
+\fITERM\fP
+Determine the terminal type. If this variable is unset or null, and
+if the \fB-T\fP option is not specified, an unspecified
+default terminal type shall be used.
+.sp
+.SH ASYNCHRONOUS EVENTS
+.LP
+Default.
+.SH STDOUT
+.LP
+If standard output is a terminal, the appropriate sequence to clear
+and set the tab stops may be written to standard output in
+an unspecified format. If standard output is not a terminal, undefined
+results occur.
+.SH STDERR
+.LP
+The standard error shall be used only for diagnostic messages.
+.SH OUTPUT FILES
+.LP
+None.
+.SH EXTENDED DESCRIPTION
+.LP
+None.
+.SH EXIT STATUS
+.LP
+The following exit values shall be returned:
+.TP 7
+\ 0
+Successful completion.
+.TP 7
+>0
+An error occurred.
+.sp
+.SH CONSEQUENCES OF ERRORS
+.LP
+Default.
+.LP
+\fIThe following sections are informative.\fP
+.SH APPLICATION USAGE
+.LP
+This utility makes use of the terminal's hardware tabs and the \fIstty\fP
+\fItabs\fP
+option.
+.LP
+This utility is not recommended for application use.
+.LP
+Some integrated display units might not have escape sequences to set
+tab stops, but may be set by internal system calls. On
+these terminals, \fItabs\fP works if standard output is directed to
+the terminal; if output is directed to another file, however,
+\fItabs\fP fails.
+.SH EXAMPLES
+.LP
+None.
+.SH RATIONALE
+.LP
+Consideration was given to having the \fItput\fP utility handle all
+of the functions
+described in \fItabs\fP. However, the separate \fItabs\fP utility
+was retained because it seems more intuitive to use a command
+named \fItabs\fP than \fItput\fP with a new option. The \fItput\fP
+utility does not support setting or clearing tabs, and no known historical
+version of
+\fItabs\fP supports the capability of setting arbitrary tab stops.
+.LP
+The System V \fItabs\fP interface is very complex; the version in
+this volume of IEEE\ Std\ 1003.1-2001 has a reduced
+feature list, but many of the features omitted were restored as XSI
+extensions even though the supported languages and coding
+styles are primarily historical.
+.LP
+There was considerable sentiment for specifying only a means of resetting
+the tabs back to a known state-presumably the
+"standard" of tabs every eight positions. The following features were
+omitted:
+.IP " *" 3
+Setting tab stops via the first line in a file, using -- \fIfile\fP.
+Since even the SVID has no complete explanation of this
+feature, it is doubtful that it is in widespread use.
+.LP
+.LP
+In an early proposal, a \fB-t\fP \fItablist\fP option was added for
+consistency with \fIexpand\fP; this was later removed when inconsistencies
+with the historical list of tabs were
+identified.
+.LP
+Consideration was given to adding a \fB-p\fP option that would output
+the current tab settings so that they could be saved and
+then later restored. This was not accepted because querying the tab
+stops of the terminal is not a capability in historical
+\fIterminfo\fP or \fItermcap\fP facilities and might not be supported
+on a wide range of terminals.
+.SH FUTURE DIRECTIONS
+.LP
+None.
+.SH SEE ALSO
+.LP
+\fIexpand\fP , \fIstty\fP , \fItput\fP , \fIunexpand\fP
+.SH COPYRIGHT
+Portions of this text are reprinted and reproduced in electronic form
+from IEEE Std 1003.1, 2003 Edition, Standard for Information Technology
+-- Portable Operating System Interface (POSIX), The Open Group Base
+Specifications Issue 6, Copyright (C) 2001-2003 by the Institute of
+Electrical and Electronics Engineers, Inc and The Open Group. In the
+event of any discrepancy between this version and the original IEEE and
+The Open Group Standard, the original IEEE and The Open Group Standard
+is the referee document. The original Standard can be obtained online at
+http://www.opengroup.org/unix/online.html .