The tb command defines tab stops for use by subsequent uses of the TAB key.
tb tabstop{tabstop...}
| tabstop | Indicates tab positions. |
Pressing TAB embeds a specific number of spaces in the current item. Each argument is separated by a space. The maximum is 16 tab stops.
Pressing TAB (or CTRL+I) while in insert mode positions the cursor to the next defined tab stop. The TAB key has no effect when positioned beyond the last tab stop (see tabs command in Terminal Control Language).
tb 3 6 9 12 15 18 21