在循环内的 bash shell 脚本中执行 ssh 命令
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Executing ssh command in a bash shell script within a loop
提问by Roland
I'm trying to execute an ssh command within a a bash shell script that should perform the following: 1) ssh to host 2) execute command 3) print value of command 4) repeat steps 1 -3 5) exit bash shell script
我正在尝试在 bash shell 脚本中执行 ssh 命令，该命令应该执行以下操作：1) ssh 到主机 2) 执行命令 3) 打印命令值 4) 重复步骤 1 -3 5) 退出 bash shell 脚本
I have set up password less entry to the remote host, added host key to remote host
我已经设置了远程主机的无密码进入，向远程主机添加了主机密钥
I want to test the various states of the httpd process running on the remote host Within a text file, httpd_process.txt, I have:
我想测试在远程主机上运行的 httpd 进程的各种状态 在一个文本文件 httpd_process.txt 中，我有：
/etc/init.d/httpd status (stop, start, restart)
/etc/init.d/httpd 状态（停止、启动、重启）
I do the following in the script:
我在脚本中执行以下操作：
while read LINE
do
echo "Httpd Request: $LINE"
status=`$LINE`
echo "Status: $status"
sleep 5 # sleep so that next
done < /path_name/httpd_process.txt
exit 0
I assumed that each time through the loop another input string is read from the input text file and the request is made to the remote host. However, what I experience is that after the first request the script terminates. Am I correct to assume that as the first request is sent it creates a child process and once that process completes my script completes and the next turn through the loop is not executed?
我假设每次通过循环从输入文本文件中读取另一个输入字符串，并向远程主机发出请求。但是，我的经验是在第一个请求之后脚本终止。我是否正确假设在发送第一个请求时它会创建一个子进程，并且一旦该进程完成我的脚本完成并且不执行循环的下一轮？
回答by Ignacio Vazquez-Abrams
sshis consuming stdin. Pass it -nto prevent this.
ssh正在消耗标准输入。传递它-n以防止这种情况发生。
