generate DotCloud ssh -D bash script

#! /bin/bash
printf "输入 DotCloud 认用名字: " >&2
read
AppID="${REPLY}.www"
key="$HOME/.dotcloud/dotcloud.key"
lport=7070
rport=$(dotcloud info "$AppID" | sed '/ssh:\/\/.*/!d;s/^.*\/\///' | cut -d: -f2)
host=$(dotcloud info "$AppID" | sed '/ssh:\/\/.*/!d;s/^.*\/\///' | cut -d: -f1)
script_name="$HOME/${REPLY}_ssh"

if [ ! -f "$key" ] ; then
   echo "You do not have $key, I can\'t make ssh script" >&2
   exit 5
fi
if [ -z "$host" ] ; then
   echo "Your DotCloud APPID seems not found. Fail to make ssh script." >&2
   exit 6
fi

echo "ssh -i $key -vNfD $lport $host -p $rport" > "$script_name"
[ $? -eq 0 ] && chmod 755 "$script_name" && echo "$script_name is made."
exit 0