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+'\" et
+.TH TABS "1P" 2013 "IEEE/The Open Group" "POSIX Programmer's Manual"
+.SH PROLOG
+This manual page is part of the POSIX Programmer's Manual.
+The Linux implementation of this interface may differ (consult
+the corresponding Linux manual page for details of Linux behavior),
+or the interface may not be implemented on Linux.
+
+.SH NAME
+tabs
+\(em set terminal tabs
+.SH SYNOPSIS
+.LP
+.nf
+tabs \fB[\fR\(mi\fIn\fP|\(mia|\(mia2|\(mic|\(mic2|\(mic3|\(mif|\(mip|\(mis|\(miu\fB] [\fR\(miT \fItype\fB]\fR
+.P
+tabs \fB[\fR\(miT \fItype\fB] \fIn\fB[[\fIsep\fB[\fR+\fB]\fIn\fB]\fR...\fB]\fR
+.fi
+.SH DESCRIPTION
+The
+.IR tabs
+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.
+.P
+The phrase ``tab-stop position
+.IR N ''
+shall be taken to mean that, from the start of a line of output,
+tabbing to position
+.IR N
+shall cause the next character output to be in the (\c
+.IR N +1)th
+column position on that line. The maximum number of tab stops allowed
+is terminal-dependent.
+.P
+It need not be possible to implement
+.IR tabs
+on certain terminals. If the terminal type obtained from the
+.IR TERM
+environment variable or
+.BR \(miT
+option represents such a terminal, an appropriate diagnostic message
+shall be written to standard error and
+.IR tabs
+shall exit with a status greater than zero.
+.SH OPTIONS
+The
+.IR tabs
+utility shall conform to the Base Definitions volume of POSIX.1\(hy2008,
+.IR "Section 12.2" ", " "Utility Syntax Guidelines",
+except for various extensions: the options
+.BR \(mia2 ,
+.BR \(mic2 ,
+and
+.BR \(mic3
+are multi-character.
+.P
+The following options shall be supported:
+.IP "\fB\(mi\fIn\fR" 10
+Specify repetitive tab stops separated by a uniform number of column
+positions,
+.IR n ,
+where
+.IR n
+is a single-digit decimal number. The default usage of
+.IR tabs
+with no arguments shall be equivalent to
+.IR tabs
+\(mi8. When
+.BR \(mi0
+is used, the tab stops shall be cleared and no new ones set.
+.IP "\fB\(mia\fP" 10
+1,10,16,36,72
+.br
+Assembler, applicable to some mainframes.
+.IP "\fB\(mia2\fP" 10
+1,10,16,40,72
+.br
+Assembler, applicable to some mainframes.
+.IP "\fB\(mic\fP" 10
+1,8,12,16,20,55
+.br
+COBOL, normal format.
+.IP "\fB\(mic2\fP" 10
+1,6,10,14,49
+.br
+COBOL, compact format (columns 1 to 6 omitted).
+.IP "\fB\(mic3\fP" 10
+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
+.BR \(mic2 .
+.IP "\fB\(mif\fP" 10
+1,7,11,15,19,23
+.br
+FORTRAN
+.IP "\fB\(mip\fP" 10
+1,5,9,13,17,21,25,29,33,37,41,45,49,53,57,61
+.br
+PL/1
+.IP "\fB\(mis\fP" 10
+1,10,55
+.br
+SNOBOL
+.IP "\fB\(miu\fP" 10
+1,12,20,44
+.br
+Assembler, applicable to some mainframes.
+.IP "\fB\(miT\ \fItype\fR" 10
+Indicate the type of terminal. If this option is not supplied and the
+.IR TERM
+variable is unset or null, an unspecified default terminal type shall
+be used. The setting of
+.IR type
+shall take precedence over the value in
+.IR TERM .
+.SH OPERANDS
+The following operand shall be supported:
+.IP "\fIn\fB[[\fIsep\fB[\fR+\fB]\fIn\fB]\fR...\fB]\fR" 10
+A single command line argument that consists of one or more tab-stop
+values (\c
+.IR n )
+separated by a separator character (\c
+.IR sep )
+which is either a
+<comma>
+or a
+<blank>
+character. The application shall ensure that the tab-stop values are
+positive decimal integers in strictly ascending order. If any tab-stop
+value (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
+.BR \(dq1 10 +10 +10\(dq 
+are considered to be identical.
+.SH STDIN
+Not used.
+.SH "INPUT FILES"
+None.
+.SH "ENVIRONMENT VARIABLES"
+The following environment variables shall affect the execution of
+.IR tabs :
+.IP "\fILANG\fP" 10
+Provide a default value for the internationalization variables that are
+unset or null. (See the Base Definitions volume of POSIX.1\(hy2008,
+.IR "Section 8.2" ", " "Internationalization Variables"
+for the precedence of internationalization variables used to determine
+the values of locale categories.)
+.IP "\fILC_ALL\fP" 10
+If set to a non-empty string value, override the values of all the
+other internationalization variables.
+.IP "\fILC_CTYPE\fP" 10
+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).
+.IP "\fILC_MESSAGES\fP" 10
+.br
+Determine the locale that should be used to affect the format and
+contents of diagnostic messages written to standard error.
+.IP "\fINLSPATH\fP" 10
+Determine the location of message catalogs for the processing of
+.IR LC_MESSAGES .
+.IP "\fITERM\fP" 10
+Determine the terminal type. If this variable is unset or null, and if
+the
+.BR \(miT
+option is not specified, an unspecified default terminal type shall be
+used.
+.SH "ASYNCHRONOUS EVENTS"
+Default.
+.SH STDOUT
+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
+The standard error shall be used only for diagnostic messages.
+.SH "OUTPUT FILES"
+None.
+.SH "EXTENDED DESCRIPTION"
+None.
+.SH "EXIT STATUS"
+The following exit values shall be returned:
+.IP "\00" 6
+Successful completion.
+.IP >0 6
+An error occurred.
+.SH "CONSEQUENCES OF ERRORS"
+Default.
+.LP
+.IR "The following sections are informative."
+.SH "APPLICATION USAGE"
+This utility makes use of the terminal's hardware tabs and the
+.IR stty
+.IR tabs
+option.
+.P
+This utility is not recommended for application use.
+.P
+Some integrated display units might not have escape sequences to set
+tab stops, but may be set by internal system calls. On these
+terminals,
+.IR tabs
+works if standard output is directed to the terminal; if output is
+directed to another file, however,
+.IR tabs
+fails.
+.SH EXAMPLES
+None.
+.SH RATIONALE
+Consideration was given to having the
+.IR tput
+utility handle all of the functions described in
+.IR tabs .
+However, the separate
+.IR tabs
+utility was retained because it seems more intuitive to use a command
+named
+.IR tabs
+than
+.IR tput
+with a new option. The
+.IR tput
+utility does not support setting or clearing tabs, and no known
+historical version of
+.IR tabs
+supports the capability of setting arbitrary tab stops.
+.P
+The System V
+.IR tabs
+interface is very complex; the version in this volume of POSIX.1\(hy2008 has a reduced feature
+list, but many of the features omitted were restored as part of the
+XSI option even though the supported languages and coding styles are
+primarily historical.
+.P
+There was considerable sentiment for specifying only a means of
+resetting the tabs back to a known state\(empresumably the ``standard''
+of tabs every eight positions. The following features were omitted:
+.IP " *" 4
+Setting tab stops via the first line in a file, using \(mi\|\(mi\c
+.IR file .
+Since even the SVID has no complete explanation of this feature, it is
+doubtful that it is in widespread use.
+.P
+In an early proposal, a
+.BR \(mit
+.IR tablist
+option was added for consistency with
+.IR expand ;
+this was later removed when inconsistencies with the historical list of
+tabs were identified.
+.P
+Consideration was given to adding a
+.BR \(mip
+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
+.IR terminfo
+or
+.IR termcap
+facilities and might not be supported on a wide range of terminals.
+.SH "FUTURE DIRECTIONS"
+None.
+.SH "SEE ALSO"
+.IR "\fIexpand\fR\^",
+.IR "\fIstty\fR\^",
+.IR "\fItput\fR\^",
+.IR "\fIunexpand\fR\^"
+.P
+The Base Definitions volume of POSIX.1\(hy2008,
+.IR "Chapter 8" ", " "Environment Variables",
+.IR "Section 12.2" ", " "Utility Syntax Guidelines"
+.SH COPYRIGHT
+Portions of this text are reprinted and reproduced in electronic form
+from IEEE Std 1003.1, 2013 Edition, Standard for Information Technology
+-- Portable Operating System Interface (POSIX), The Open Group Base
+Specifications Issue 7, Copyright (C) 2013 by the Institute of
+Electrical and Electronics Engineers, Inc and The Open Group.
+(This is POSIX.1-2008 with the 2013 Technical Corrigendum 1 applied.) 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.unix.org/online.html .
+
+Any typographical or formatting errors that appear
+in this page are most likely
+to have been introduced during the conversion of the source files to
+man page format. To report such errors, see
+https://www.kernel.org/doc/man-pages/reporting_bugs.html .