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Full Discussion: Append color in shell script for output
Top Forums Shell Programming and Scripting Append color in shell script for output Post 302601642 by Chubler_XL on Friday 24th of February 2012 06:03:40 AM
Old 02-24-2012
27 is the ascii value of the ESC character

The awk program pre-pends <ESC>[41m (VT100 set red rackground)
and appends <ESC>[0m (VT100 reset to normal output).

You can try it out yourself on a xterm/vt* terminal with:

Code:
awk 'BEGIN { printf("%c[41m%s%c[0m\n", 27, "Testing", 27); }'

The above will print Testing with red background.
 

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LEARN ABOUT DEBIAN

vttest

VTTEST(1)						      General Commands Manual							 VTTEST(1)

NAME

       vttest - test VT100-type terminal

SYNOPSIS

       vttest [options] [24x80.132]

DESCRIPTION

       Vttest  is  a program designed to test the functionality of a VT100 terminal (or emulator thereof).  It tests both display (escape sequence
       handling) and keyboard.

       The program is menu-driven and contains full on-line operating instructions.

       -  To run a given menu-item, you must enter its number.

       -  Menu items start at zero; this is the "Exit" item in almost all cases.

       -  You can run all menu-items (for a given level) by entering an asterisk, i.e, `*'.

       -  You can force a repaint of the menu items by entering "?".

       -  A few menus can be more than one page.  Use "n" and "p" to switch to the next or previous page.

OPTIONS

       You can specify the screen geometry in the form [24x80.132], i.e., 24 lines, 80 minimum columns, 132 maximum  columns.	If  your  terminal
       does not switch between 80 and 132 columns you may specify 24x80.80, for example, to avoid a misleading display.

       Other options are:

       -f file
	    specify a file containing a DRCS (soft character definition) string.

       -l   log test results to vttest.log.

       -p   use padding, e.g., for a VT100 connected to a high-speed line.

       -s   add time-delay in selected panning/scrolling options to show details.

       -8   use 8-bit controls (this can be changed with a menu option).

AUTHOR

       Per Lindberg (mcvax,seismo)!enea!suadb!lindberg sometime 1985.

       Modified by Thomas Dickey from June 1996, to support nonstandard screen geometry, VT220-VT520, ISO color and xterm-specific tests.

								       LOCAL								 VTTEST(1)
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