Terminal Control Commands

Advanced Bash-Scripting Guide:
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# 16.7. Terminal Control Commands

Command affecting the console or terminal

tput

  Initialize terminal and/or fetch information about it from terminfo data. Various options permit certain terminal operations: tput clear is the equivalent of clear; tput reset is the equivalent of reset.

      bash$ tput longname
      xterm terminal emulator (X Window System)

  Issuing a tput cup X Y moves the cursor to the (X,Y) coordinates in the current terminal. A clear to erase the terminal screen would normally precede this.

  Some interesting options to tput are:

  - `bold`, for high-intensity text

  - `smul`, to underline text in the terminal

  - `smso`, to render text in reverse

  - `sgr0`, to reset the terminal parameters (to normal), without clearing the screen

  Example scripts using tput:

  1. Example 36-15

  2. Example 36-13

  3. Example A-44

  4. Example A-42

  5. Example 27-2

  Note that stty offers a more powerful command set for controlling a terminal.

infocmp

  This command prints out extensive information about the current terminal. It references the terminfo database.

      bash$ infocmp
      #       Reconstructed via infocmp from file:
       /usr/share/terminfo/r/rxvt
       rxvt|rxvt terminal emulator (X Window System),
               am, bce, eo, km, mir, msgr, xenl, xon,
               colors#8, cols#80, it#8, lines#24, pairs#64,
               acsc=``aaffggjjkkllmmnnooppqqrrssttuuvvwwxxyyzz{{||}}~~,
               bel=^G, blink=\E[5m, bold=\E[1m,
               civis=\E[?25l,
               clear=\E[H\E[2J, cnorm=\E[?25h, cr=^M,
               ...

reset

  Reset terminal parameters and clear text screen. As with clear, the cursor and prompt reappear in the upper lefthand corner of the terminal.

clear

  The clear command simply clears the text screen at the console or in an xterm. The prompt and cursor reappear at the upper lefthand corner of the screen or xterm window. This command may be used either at the command line or in a script. See Example 11-26.

resize

  Echoes commands necessary to set `$TERM` and `$TERMCAP` to duplicate the size (dimensions) of the current terminal.

      bash$ resize
      set noglob;
       setenv COLUMNS '80';
       setenv LINES '24';
       unset noglob;

script

  This utility records (saves to a file) all the user keystrokes at the command-line in a console or an xterm window. This, in effect, creates a record of a session.

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