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tabs(1M)                                                              tabs(1M)



NAME
       tabs - set tabs on a terminal

SYNOPSIS
       tabs [-v[n]] [-ahuUV] file...

DESCRIPTION
       The  tabs program clears and sets tab-stops on the terminal.  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

OPTIONS
   General Options
       -Tname
            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
            asterisks.

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

       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 screen.

   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

PORTABILITY
       X/Open describes a +m option, to set a terminal's left-margin.  None of the entries in  the  terminal  database
       provide this capability.

       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
       terminals 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.

SEE ALSO
       tset(1), infocmp(1M), curses(3X), terminfo(5).

       This describes ncurses version 5.7 (patch 20090207).



                                                                      tabs(1M)