curl -x localhost:8848 www.baidu.com
#!/bin/sh -e
TMP=`mktemp -d`
BACK=$TMP/pipe.back
SENT=$TMP/pipe.sent
RCVD=$TMP/pipe.rcvd
trap 'rm -rf "$TMP"' EXIT
mkfifo -m 0600 "$BACK" "$SENT" "$RCVD"
sed 's/^/ => /' <"$SENT" &
sed 's/^/<= /' <"$RCVD" &
nc -l -p 8848 <"$BACK" | tee "$SENT" | nc www.baidu.com 80 | tee "$RCVD" >"$BACK"
问题
如何修改才能实现监听客户端访问的地址及解决端口号问题?