Question

分配写一个程序去上网并获得股票的价格。用法如下： getprice（股票代码）例如：

getprice goog
getprice msft

40％

We will get stock quotes from Yahoo, from pages like these:
    http://finance.yahoo.com/q?s=goog
    http://finance.yahoo.com/q?s=msft 

We use Yahoo because stock price is nicely delimited by tags. Something like:
    <span id="yfs_l84_goog">529.24</span>
    <span id="yfs_l84_msft">41.60</span> 

The first line of your script constructs the URL needed, given the command-line argument.
Use wget to download the URL to a file.
Test that is working, and the stock price is found somewhere in the file.

When the above is working: Use grep to search the file for the relevant line.
Test that you can extract the single line with the stock price on it.

100％

When the above is working: Use sed to remove from start-of-line to <span>
See string matching / regular expressions.
See start of line, end of line.
".*" matches any sequence of characters.
Check that this works before proceeding.

When the above is working: Use sed to remove from </span> to end of line.
Your program should now just print the price.

这就是我所拥有的：

wget -q -O - http://finance.yahoo.com/q?s=$1 |
grep -o '<span id="yfs_l84_goog">.*</span>*' | 
cut -c1-37 |
sed 's|<span id="yfs_l84_goog".||g' | 
sed 's|</span>||g'

当我进入getprice goog它有效但是当我输入getprice msft时，有人不能向我解释我做错了什么？感谢

Answer 1

100％：

wget -q -O - http://finance.yahoo.com/q?s=$1 |
grep -o "<span id=\"yfs_l84_$1\">.*</span>*" | 
cut -c1-37 |
sed "s|<span id=\"yfs_l84_$1\".||g" | 
sed 's|</span>||g'| 
sed 's|</||g'

Answer 2

function getprice () {
wget -q -O - http://finance.yahoo.com/q?s=$1 | sed -n "s/^.*yfs_l84_"$1"\">\([^<]*\)[<].*$/\1/p"
}

获得价格goog值：

getprice goog
#726.82

获取价格msft值：

getprice msft
#53.07

这个shell脚本任务有问题

2 个答案: