+IEEE Std 1003.1/The Open Group Base Specifications Issue 7
+(POSIX.1-2008)
+describes a
+.B tabs
+utility.
+However,
+.bP
+this standard describes a
+.B +m
+option to set a terminal's left margin.
+Very few of the entries in the terminal database provide the
+.B \%set_left_margin
+.RB ( smgl )
+or
+.B \%set_left_margin_parm
+.RB \%( smglp )
+capabilities needed to support the feature.
+.bP
+There is no counterpart in X/Open Curses Issue 7 for this utility,
+unlike \fB@TPUT@\fP(1).
+.PP
+The
+.B \-d
+(debug) and
+.B \-n
+(no-op) options are
+.I \%ncurses
+extensions not provided by other implementations.
+.SH HISTORY
+A
+.B tabs
+utility appeared in PWB/Unix 1.0 (1977).
+.\" https://minnie.tuhs.org/cgi-bin/utree.pl?file=PWB1/sys/source/s2/\
+.\" tabs.c
+A reduced version shipped in Seventh Edition Unix
+(early 1979)
+.\" https://minnie.tuhs.org/cgi-bin/utree.pl?file=V7/usr/src/cmd/tabs.c
+and in 3BSD
+.\" https://minnie.tuhs.org/cgi-bin/utree.pl?file=3BSD/usr/src/cmd/\
+.\" tabs.c
+(later the same year);
+it supported a \*(``\-n\*('' option to set the first tab stop at the
+left margin.
+That option is not documented by POSIX.
+.PP
+The PWB/Unix
+.B tabs
+utility returned in System III (1980),
+and used built-in tables,
+rather than the terminal database,
+to support a half-dozen hardcopy terminal (printer) types.
+It also had built-in logic to support setting the left margin,
+as well as a feature for copying the tab settings from a file.