tabs 1

tabs(1)                                                         tabs(1)


       tabs - set tabs on a terminal


       tabs [options]] [tabstop-list]


       The  tabs  program clears and sets tab-stops on the termi-
       nal.  This uses the terminfo  clear_all_tabs  and  set_tab
       capabilities.   If  either  is  absent,  tabs is unable to
       clear/set tab-stops.  The terminal should be configured to
       use hard tabs, e.g.,

              stty tab0


General Options

            Tell tabs which terminal type to use.  If this option
            is not given, tabs will  use  the  $TERM  environment
            variable.   If  that  is  not  set,  it  will use the
            ansi+tabs entry.

       -d   The debugging option shows a ruler line, followed  by
            two  data  lines.   The  first  data  line  shows the
            expected tab-stops marked with asterisks.  The second
            data  line  shows  the  actual tab-stops, marked with

       -n   This option tells tabs to check the options  and  run
            any  debugging option, but not to modify the terminal

       -V   reports the version of ncurses which was used in this
            program, and exits.

       The  tabs  program  processes  a single list of tab stops.
       The last option to be processed which defines  a  list  is
       the one that determines the list to be processed.

Implicit Lists

       Use  a  single number as an option, e.g., "-5" to set tabs
       at the given interval (in this case  1,  6,  11,  16,  21,
       etc.).   Tabs  are  repeated up to the right margin of the

       Use "-0" to clear all tabs.

       Use "-8" to set tabs to the standard interval.

Explicit Lists

       An explicit list can be defined after  the  options  (this
       does  not  use  a "-").  The values in the list must be in
       increasing numeric order, and greater than zero.  They are
       separated by a comma or a blank, for example,

              tabs 1,6,11,16,21
              tabs 1 6 11 16 21
       Use  a  '+'  to treat a number as an increment relative to
       the previous value, e.g.,

              tabs 1,+5,+5,+5,+5

       which is equivalent to the 1,6,11,16,21 example.

Predefined Tab-Stops

       X/Open defines several predefined lists of tab stops.

       -a   Assembler, IBM S/370, first format

       -a2  Assembler, IBM S/370, second format

       -c   COBOL, normal format

       -c2  COBOL compact format

       -c3  COBOL compact format extended

       -f   FORTRAN

       -p   PL/I

       -s   SNOBOL

       -u   UNIVAC 1100 Assembler


       IEEE Std 1003.1/The Open Group  Base Specifications  Issue
       7 (POSIX.1-2008) describes a tabs utility.  However

       o   This  standard  describes a +m option, to set a termi-
           nal's left-margin.  Very few of  the  entries  in  the
           terminal database provide this capability.

       o   There  is  no counterpart in X/Open Curses Issue 7 for
           this utility, unlike tput(3x).

       The -d (debug) and -n (no-op) options are  extensions  not
       provided by other implementations.

       Documentation  for other implementations states that there
       is a limit on the number of tab stops.  While some  termi-
       nals may not accept an arbitrary number of tab stops, this
       implementation will attempt to set tab  stops  up  to  the
       right  margin  of the screen, if the given list happens to
       be that long.


       tset(1), infocmp(1m), curses(3x), terminfo(5).

       This describes ncurses version 6.0 (patch 20160521).