02-11-2011
Terminals.. in the Unix sense... have capabilities. Even pseudo-terminal graphical clients.
The "right" answer is to properly query the terminal capabilities and use the data passed back as the "right" way to present terminal attributes.
For example.... doing bold=`tput bold` (or you use $()'s for ksh or bash) will get you the capabilities string for enabling BOLD on the terminal.
sgr=`tput sgr0` will give you the string for doing a capabilities reset.
So.. then, you can:
echo "The following is ${bold}BOLD${sgr}... see it?"
To get underline, smul=`tput smul`
Now... color is HARDER. Unless you limit your terminal choices. You can look at your terminal capabilities in total using "infocmp".. HOWEVER, that assumes you have a terminal definition that adequately covers your whole set of terminal capabilities (and... having done this for a LONG time... most DO NOT cover the whole set).
On ANSI like terminals, you can usually do tput setaf <number> to set a foreground color and tput setab <number> to set a background color... Setting the palette of colors is again a VERY terminal - to - terminal specific thing... sometimes it can be altered, sometimes not. Some terminals allow selection of colors using a longer syntax wherein color values can be given. Again, color is a "less" portable option.
The termcap and (now) terminfo way of handling terminal capabilities is a VERY good and generic way of dealing with multi-vendor devices. As with most all things Unix, the "standard" is to support them all!!!!
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LEARN ABOUT OSX
set_color
set_color(1) fish set_color(1)
NAME
set_color - set_color - set the terminal color
set_color - set the terminal color
Synopsis
set_color [-v --version] [-h --help] [-b --background COLOR] [COLOR]
Description
Change the foreground and/or background color of the terminal. COLOR is one of black, red, green, brown, yellow, blue, magenta, purple,
cyan, white and normal.
o -b, --background Set the background color
o -c, --print-colors Prints a list of all valid color names
o -h, --help Display help message and exit
o -o, --bold Set bold or extra bright mode
o -u, --underline Set underlined mode
o -v, --version Display version and exit
Calling set_color normal will set the terminal color to whatever is the default color of the terminal.
Some terminals use the --bold escape sequence to switch to a brighter color set. On such terminals, set_color white will result in a grey
font color, while set_color --bold white will result in a white font color.
Not all terminal emulators support all these features. This is not a bug in set_color but a missing feature in the terminal emulator.
set_color uses the terminfo database to look up how to change terminal colors on whatever terminal is in use. Some systems have old and
incomplete terminfo databases, and may lack color information for terminals that support it. Download and install the latest version of
ncurses and recompile fish against it in order to fix this issue.
Version 1.23.1 Sun Jan 8 2012 set_color(1)