shell下解码url

http://aaronw.me/static/779.html

封装了一下，有需要的拿走

function url_decode()
{
  local url=$
  echo $url |
  awk 'BEGIN {
  for(i=;i<;i++)
    hex[i]=i;
    hex["A"]=hex["a"]=;
    hex["B"]=hex["b"]=;
    hex["C"]=hex["c"]=;
    hex["D"]=hex["d"]=;
    hex["E"]=hex["e"]=;
    hex["F"]=hex["f"]=;
  }
  {
    gsub(/\+/," ");
    i=$;
    while(match(i,/%../)) {
      if(RSTART>);
      printf"%s",substr(i,,RSTART-);
      printf"%c",hex[substr(i,RSTART+,)]*+hex[substr(i,RSTART+,)];
      i=substr(i,RSTART+RLENGTH);
    }
    print i;
  }' -
}

url="http%3A%2F%2Fclub.fir.im%2Ftopic%2F546abf22ba23eab90aa29c99&aid=1619&nid=51"

url_decode $url

http://club.fir.im/topic/546abf22ba23eab90aa29c99&aid=1619&nid=51