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##输出彩色

declare -r g_red="\e[0;31;44m"
declare -r g_green="\e[0;32m"
declare -r g_blue="\e[0;34m"
declare -r g_end="\e[0m"

echo -e "${g_red}read${g_end}"
echo -e "${g_green}green${g_end}"
echo -e "${g_blue}blue${g_end}"

we used the ANSI escape sequence \e[attribute code;text color codem to display a blue text

####Attribute codes: 00=none 01=bold 04=underscore 05=blink 07=reverse 08=concealed

####Text color codes: 30=black 31=red 32=green 33=yellow 34=blue 35=magenta 36=cyan 37=white

####Background color codes: 40=black 41=red 42=green 43=yellow 44=blue 45=magenta 46=cyan 47=white

Black       0;30     Dark Gray     1;30
Blue        0;34     Light Blue    1;34
Green       0;32     Light Green   1;32
Cyan        0;36     Light Cyan    1;36
Red         0;31     Light Red     1;31
Purple      0;35     Light Purple  1;35
Brown       0;33     Yellow        1;33
Light Gray  0;37     White         1;37

##参考

  1. http://www.tldp.org/HOWTO/Bash-Prompt-HOWTO/x329.html
  2. http://www.csc.uvic.ca/~sae/seng265/fall04/tips/s265s047-tips/bash-using-colors.html