### 25.4 TUI-specific Commands

The TUI has specific commands to control the text windows. These commands are always available, even when gdb is not in the TUI mode. When gdb is in the standard mode, most of these commands will automatically switch to the TUI mode.

Note that if gdb's `stdout` is not connected to a terminal, or gdb has been started with the machine interface interpreter (see The gdb/mi Interface), most of these commands will fail with an error, because it would not be possible or desirable to enable curses window management.

`tui enable`
  Activate TUI mode. The last active TUI window layout will be used if TUI mode has prevsiouly been used in the current debugging session, otherwise a default layout is used.
`tui disable`
  Disable TUI mode, returning to the console interpreter.
`info win`
  List and give the size of all displayed windows.
`layout next`
  Display the next layout.
`layout prev`
  Display the previous layout.
`layout src`
  Display the source window only.
`layout asm`
  Display the assembly window only.
`layout split`
  Display the source and assembly window.
`layout regs`
  Display the register window together with the source or assembly window.
`focus next`
  Make the next window active for scrolling.
`focus prev`
  Make the previous window active for scrolling.
`focus src`
  Make the source window active for scrolling.
`focus asm`
  Make the assembly window active for scrolling.
`focus regs`
  Make the register window active for scrolling.
`focus cmd`
  Make the command window active for scrolling.
`refresh`
  Refresh the screen. This is similar to typing `C-L`.
`tui reg` group
  Changes the register group displayed in the tui register window to group. If the register window is not currently displayed this command will cause the register window to be displayed. The list of register groups, as well as their order is target specific. The following groups are available on most targets:
  `next`
    Repeatedly selecting this group will cause the display to cycle through all of the available register groups.
  `prev`
    Repeatedly selecting this group will cause the display to cycle through all of the available register groups in the reverse order to next.
  `general`
    Display the general registers.
  `float`
    Display the floating point registers.
  `system`
    Display the system registers.
  `vector`
    Display the vector registers.
  `all`
    Display all registers.
`update`
  Update the source window and the current execution point.
`winheight` name`+`count
`winheight` name`-`count
  Change the height of the window name by count lines. Positive counts increase the height, while negative counts decrease it. The name parameter can be one of `src` (the source window), `cmd` (the command window), `asm` (the disassembly window), or `regs` (the register display window).
`tabset` nchars
  Set the width of tab stops to be nchars characters. This setting affects the display of TAB characters in the source and assembly windows.