curl - 带有 curl 和 grep 的 shell 脚本

Question

我有一组网址。我想打开它们，如果它们打开时没有任何错误，则将状态显示为正在运行，否则未运行。如何通过从当前输出中删除所有其他消息来实现下面提到的所需输出。

 #!/bin/ksh
 urlArray=('http://url1:port1' 'http://url2:port2' 'http://url3:port3')
for url in "${urlArray[@]}"
 do 
   result=`curl $url | head -1`

    if (echo $result | grep '<?xml' >/dev/null 2>&1); then
        echo Running
    else
        echo Not Running
     fi
 done

脚本的当前输出为

  % Total    % Received % Xferd  Average Speed   Time    Time     Time  Current
                                 Dload  Upload   Total   Spent    Left  Speed
100 12980    0 12980    0     0   711k      0 --:--:-- --:--:-- --:--:--     0
Running

curl: (6) Couldn't resolve host 'url2:port2'
Not Running

curl: (6) Couldn't resolve host 'url3:port3'
Not Running

所需输出:

Running
Not Running
Not Running

Answer 1

-s标志抑制输出:

$ curl foo
curl: (6) Couldn't resolve host 'foo'
$ curl -s foo
$ 

从 curl 手册页:

   -s/--silent
          Silent or quiet mode. Don't show progress meter or error messages.  Makes Curl mute.