My PS1 setting

PS1="\`if [ \$? = 0 ]; then echo \[\e[33m\]^_^\[\e[0m\]; else echo \[\e[31m\]O_O\[\e[0m\]; fi\`[\u@:\w]\\$";

原文链接： http://blog.csdn.net/crazyjixiang/article/details/6488464