cut、tr 等命令格式化字符串

CurreIP=$(wget http://freedns.afraid.org/dynamic/check.php -o /dev/null -O /dev/stdout | grep Detected | cut -d : -f 2 | cut -d '<' -f 1 | tr -d " ")

cat check.php :

Detected IP : 210.73.65.34, 210.73.65.77
HTTP_CLIENT_IP :
HTTP_X_FORWARDED_FOR : 210.73.65.34, 210.73.65.77
REMOTE_ADDR : 72.20.25.132